Because the whole piece is based on the room/wall size, I won't be giving you exact measurements. These will vary in your room.
This is also my first "instructable" so please if you have any questions or I've left something out, ask and I'll give you the answer. :)
1 8ft 4x4
2 sheets 4x8 MDF
hinges for door
Step 1: Hyrule Bed
Also you will need to make sure you have the mattress that you want to use for the top and the bottom bunk. You will need the sizes to build the frame.
After you decide how high you want the bed, you will need a stud finder and you will need to mark the location of the studs in your walls. You need to know the location of them to put in the ledger board.
To mount the ledger boards to the wall, you need lag bolts and washers. We used to lag bolts per stud for extra strength. Mark the height around the wall and make sure you use a level to keep everything straight. The whole frame is based off of your ledger board. In the following pictures you can see how it goes down the long wall and then on the end walls.
Step 3: Frame Foundation
Once you have decided you will need to add in your 4x4's. There is no need to have your 4x4 next to the wall. The ledger board is strong enough to hold it up.
After deciding where you put your support 4x4, you will need to attach it to your ledger board. I used joist hangers to attach the 2x4's from the ledger board to the support beam. I centered the support 2x4's on the 4x4. Make sure you level everything out.
Do the other end the same way. You will notice in the pictures that the 4x4 is just a little taller than the frame work. This was to allow me to build a platform on the end.
After you have the corners done, using a joist hanger add your front support rail. At this time, you also need to add in your support ledger and framework for the lower bunk using the same method you used to build the top support. Make sure that the mattress fits in the area. We also used bunkies to add to the strength of the bed.
Now you should have the outer frame, the inner frame/stats for both the top and bottom bunk.
Step 5: The Castle
To give the castle a little depth, the long wall is cut to fit the frame. This goes back to centering the outer support beam on the 4x4, this gave me enough room to attach the long wall in a little. To make sure that it doesn't anywhere, it is screwed to the outer frame and I used L brackets to slats as well.
The tall castle walls are screwed to the outer frame as well. For extra support on the door area, we added a support beam from to the wall and screwed the castle wall to it. The tall walls are attached to the 4x4's outer edge and overlap the long wall.
I also painted the castle walls on both side before putting them on the bed.
The painting was done by applying a coat of light grey paint first. To get the darker rock effect, I took a sponge and tore chunks out of it. I then dipped it in darker grey paint. It gives it a rocky feel.
Step 6: Hyrule Symbol
Since every castle is covered in vines, I used another sponge cut in the shape of a leaf and sponge painted those in place. The vine between the leaves was done freehand. I also took the backs off of some costume jewelry and hot glued them to the walls just to give it a more "girly" feel.
Since her cat likes to sleep with her I had to make an easy way for the cat to get to the top bunk. I found these really cool shelf brackets that look like chain and added the "draw window".
The ladder was built from 2x4's and screwed into the 4x4 for stability. And I used L brackets to attach it to the top bunk frame.
Step 7: Finished Project.
To complete the look, since her floor is painted concrete (all our floors are painted concrete or tile because of allergies), we painted a "rock pathway" from the door to all the areas of her room and pained a flower bed in the middle of it for a court yard.
To hang the curtains in the lower bunk, I mounted a curtain rod on the inside of the castle walls. (This didn't last long because she didn't like it.)