I am not sure if I should post this here or in another forum, so I hope a moderator will move it if necessary.
I bought a little house to which I will be moving in the summer, if I can get it livable in time. It has two bedrooms, one about 8x9 feet and the other 9x9. I'll be in one and my mother is going to use the other one. Both will have twin beds, and since the rooms are so small I'd like to make large drawers that go under the beds for storage. I don't know how many drawers I should plan to divide the space into. In theory larger drawers seem more efficient, if I can get slides that are good enough to make them easy to open. My initial idea is to make two drawers which would each be about 3 feet square or 3 drawers at 2' wide and 3' deep, but these may be too big, I don't know.
Another thing I am thinking about is the mattress support structure. It seems to me that the thinner I can make this the more depth there will be for storage, as long as there's enough strength to avoid sagging. My current bed is a temporary one that I've had for the last 20 years with a 2x6 down each side, 2x6 legs at the ends, and 3/4" plywood across the top. Another wrinkle I should mention is that my bed has a standard 39x75 twin mattress and a 15"x39" piece of couch cushion foam at the end, on which I put my pillow and, when I'm sleeping, my head. This makes for an overall length of 90". I was thinking about whether a torsion box would be an advantage for the top. Weight is not a problem, I'm just thinking about stiffness with minimal thickness. I've got some ash and cherry and red maple to build the bed frames and drawers and such. I'll be grateful for any advice as to how to proceed.