This bouldering wall was designed to go into my dorm room at college and thus needed to maximise space and be able to be transported the three hours to school. The general design is comprised of three sections that make up the main frame. Each frame is a 4x8 shape which is the general size of the bed of most pickup trucks and (for me!) mini vans. The three sections are held together by two eight foot 2x10's and an eight foot 2x4" which also supports the bed. Plywood climbing sections are then bolted onto the frame and all are small enough to fit into the specified transportation. As far as the design goes, the bed is located behind the top section and storage can be added behind the angled climbing section. It was a super fun (if at times a little frustrating haha) build, and the climb is surprisingly challenging and robust for the 8x4x8' foot print of the structure.
Step 1: Materials
* 132 ft of 2x4" boards. (I recommend buying in 8ft lengths to minimize cutting, and if you do you'll need 19 boards.)
* 16 ft of 2x10" boards. (At 8ft lengths you'll need 2 boards.)
* 96 sqft of cabinet grade 3/4" thick plywood (This comes in 8x4 sheets, you'll need three)
I know I know, this is quite a chunk of plywood. But it makes for a very stable wall, I promise! Also I strongly strongly recommend not being stingy on the ply wood! The cabinet grade is much sturdier and is key for stabilizing this design. Also it looks nice and will keep a lot of splinters out of your hands and feet when climbing.
* large box of 2" wood screws (~150)
* medium box of 1.25" wood screw (~50)
* small box of 3" wood screws (~20)
*  right angle brackets for 2x4's
*  3/8"-16 x 5-1/2" carriage bolts (3/8in thickness, 5.5in length)
*  3/8" x 3" carriage bolts
*  3/8" washers
*  3/8" hex nuts
Be sure to check the picture of the right angle bracket. I hope I counted this all right haha... buy a little extra and don't be mad if I didn't!
* [~50] climbing holds with bolts and T nuts
I used the link from the other freestanding climbing wall's instructable. <http://rockymountainclimbinggear.com/id71.html> I also highly recommend these holds. The shipping was fast the holds are great and were the lowest price I could find. Also peep some other instructables on how to make your own if you've got the chutzpah for that too. If you have some that are better/cheaper/magical post a link in the comments for me!
In the end the holds I first went with proved to be some very difficult climbing for some of my less experienced friends (and myself!) so I went a ahead and got one of the megapacks by Metolius. I got the 50 hold pack and it's a great amount of holds for this wall and is by far the best value of the mega pack sizes (most jugs/macros and least footholds for your $). These holds made it fun for everyone to jump on the wall and climb which definitely made it worth the extra money, also the colors really helped to brighten up my room! Here's a link if you have a little extra cash and want to go that route! <http://www.metoliusclimbing.com/mega_packs.html>
In my shopping around I also found some other good companies, including a personal favorite The Detroit Rock Climbing Company. I have yet to get my hands on their holds but it looks like they have some really good quality stuff along with a variety pack similar to the metolius one above. I'll update this instructable once I can get some for my wall, but I'm from Detroit and love to support that city so if you like this instructable, go with DRCC! <http://www.thedrcc.com/catalog/>
The tools are pretty generic. A good drill with lots of extra batteries is a must. A circular saw is great, you'd fry your arms trying to hand saw all this stuff. A good t-square and straight edge are key and you will use them a ton! Socket wrench with a tall 3/8" socket. 3/8" drill bits and whatever you need to pilot them. A crowbar and hammer will be your best friend when you get some bolts jammed too.
Step 2: Connecting the 2x4's
Also in this step we're going to attach our right angle brackets to the our 5 "4x4's". The bottom corner of your top right angle bracket should be 24" from the top of the plank and the bottom corner of your bottom right angle bracket should be a half inch or so from the bottom of your plank just to avoid having the metal bottom scratch any floors. Screw these into the flat face of your plank using some 2 inch wood screws.
Step 3: Making the Side Frames
To put in the diagonal bar measure 1.5' from the bottom of the back plank. This is where the bottom of diagonal should be touching. The top of the diagonal should be flush into the corner of that crossing bar. You're going to want to attach the bars with some of your longer bolts. Counter sink some holes in the boards for a flush fit with the washers and a flush fit against the wall. Drilling at an angle through the 2x4's is tricky, just make sure you mark where you want the bolt to go in AND come out on the other side, line the two as close as you can with your first pilot hole and work it close to perfect with each successive pilot hole.
Keep all your edges clean and flat! If you're not precise somewhere go back and redo it, don't let it slide!
Step 4: Making the Middle Frame
Step 5: Assembling the Frame
**Notes on the picture: The 2x4 in the bottom of the diagonals is not screwed in. I considered putting it there, but you do not need it in the long run. If you want to add a little more stability while you're putting on the plywood feel free... but it won't need to stay long term. Also in the picture I have all 2x4's across the top. I switched the end ones out for the 2x6's. You'll need the 2x6's to support a bed.
Step 6: Cutting the Plywood
Step 7: Plywood: Top Section
Step 8: Plywood: Bottom Section
Step 9: Plywood: Middle Section
Step 10: Putting on the Handholds
Step 11: Customization
Your wall is pretty much done from here! Enjoy the climbing! You should be left with a bit of scrap wood and there's some cool stuff you can do with it all. A small step ladder up to the bed is a nice feature, putting in shelving behind the angled section works well too. If you wanted to use the left over plywood and add more holds onto the corner that would be cool! The bolts on each end are also good for hanging a hammock. I had some left over hooks at my house and I put them into the frame to hold gear and what not. You could make some holds out of the scrap wood or other things and bolt it on. The wall is pretty much your oyster!
** Small disclaimer: Climbing and building are both inherently dangerous. I'm sharing my design with you but I can't guarantee it won't fail. Use common sense, if your seams aren't tight or you think you need some more stability then add it! Double and triple check all your bolts and screws. Have fun, but be smart!
Here are some links to articles about the wall!