I never find good deals like $1 for 3-packs. Someone on the Cricut board just mentioned they found Carts at
Walmart for $15, $7.50, etc. Ours are full price.
Christy, I think your room is very workable even with all the stuff. My initial thought, is to definitely get the futon away from the wall. If you keep it in the room, put it so your cabinet and the futon are back to back. If you everything as it is, you could move the boys' desk to where the futon was, but it won't take up all the wall space. But it seems like there is good wall space behind where the futon is now, that would be perfect for a vertical storage option.
I would also look into moving your DH's stuff, to an area where there isn't as much vertical space, because there is good vertical space in that corner. The wall where the boys desk, is that a sloped ceiling there? Because that side might be a better option for his stuff. But that would necessitate a major overhaul. Basically, something like this. Orientation is the same as your sketch, so door in lower right. But I don't know if dimensions would work.
Oh wait I forgot, this is a loft...so is Tom's shelf taller than the front wall? If so, you could still flip flop the boys desk, so it basically stays where it is, and Tom's BC.