This is a simple how-to for making a good quality skate box that can be portable. The decision to make your own box is really a natural one when all street spots are a bust and the parks are overcrowded. This particular box can also be made fairly cheaply especially if you have some plywood and 2x4's lying around. The only non-common components are the right-angle bar and masonite.
I have attached a small pdf with drawings of the box and dimensions.
Here's a short video of my friend skating the box:
Step 1: Considerations and Materials List
1) The box had to be able to fit in the car. In our case unfortunately, this meant that the box had to fit into a Subaru STi. This gave us a max length of under 6'. Our final length was 66" and the box just fits in snug enough to shut the hatchback. This works fine for us but a longer length would be more comfortable to skate. I recommend going with something around 7' - 8' if you have a larger vehicle or are not concerned with moving the box. Keep in mind though that the length of the box will be limited by the length of right-angle bar that you can find. At Home Depot, the longest one I could find of decent stock was 6' length.
2) The box had to be sturdy enough to take a beating and get skated regularly without breaking down.
3) Light enough for a person to carry by hand.
Parts! The parts list is fairly short so here goes:
1) The all-important right angle bar! This is what you will actually be grinding and limits the maximum length that you box can be. As I mentioned earlier, the length of this bar will limit the maximum length of your box and at Home Depot I could only find 6' length. You should be able to find longer ones elsewhere. NOTE: make sure you are using steel or the densest metal you can find and it should be at least 1/8" thick.
2) Sheet of masonite: Try to find one that matches the thickness of your metal bar.
3) Sheet of plywood: get a sheet that is 3/4" or thicker.
4) There is not much to the 2x4's. It is important to look for the straightest pieces possible and make sure you get a little more than you think you will need.
5) Screws: we used standard 2" wood screws to fasten the top pieces (plywood, masonite, metal bar) and used 3" stainless wood screws to fasten the 2x4's to each other.
Home Depot Note: they offer a cutting service that should definitely be taken advantage of for the plywood and masonite pieces if you buy them there. I do not recommend cutting the 2x4 pieces to size there. You should be measuring each fitting as you go and then cutting the 2x4's to the correct size (there is usually some play in the actual lengths).