I'm planning to anchor it to the three walls supported by 4 x 2 batons bolted in, with vertical supports beneath these on the walls on all four corners. I'll then run joists across is and lay plywood, with holes cut beneath where the mattress will lie. It will take a double mattress with room for a small table, light, etc. and there is good head height. I'm still working out which way to put the stairs, depending on the gradient.
sounds solid. if you google 'matthias wandel bed plans' he is a youtube guy who has loads of free guides and plans for various types of beds made of 2x4s and the like.
I'm planning to anchor it to the three walls supported by 4 x 2 batons bolted in, with vertical supports beneath these on the walls on all four corners. I'll then run joists across is and lay plywood, with holes cut beneath where the mattress will lie. It will take a double mattress with room for a small table, light, etc. and there is good head height. I'm still working out which way to put the stairs, depending on the gradient.