I designed mine around a queen size bed with 1" on each side for sheets and covers. I messed up my interior length and had to use my Full Size mattress that I happened to have instead which worked out nice. If I were to do it again I would have built it 5 foot wide (not 62 1/2") and just used a full size mattress to begin with. The full size is what I have been sleeping on forever in my house and in the Teardrop the loss is just a couple inches and I don't even notice it whatsoever, plus the cost savings is there.
I LOVE having lots of extra space on the sides too for the covers to lay over and bunch up, (Do your covers stop at the side of the bed? My sheet and comforter keep going another foot! My Iron Maiden top cover is the only one that stops at the edge of the bed. I don't tuck in my comforter and top sheet, what a hassle trying to get in it at night, I let it hang over just like at home). When travelling I put my hammock and folding chair on one side and I have two big CD books, one with movies and one with music that I put on the other side, not to mention a flash light and assorted other things that just end up there and not get in your way.
