Funrover- If you carry your spare inside, I would build a deck over it (aluminium diamond plate?) then have it line up with your back seat laid down (4x4 under the back for shim) and hopfully that lines up with the front console which would give you over 6' ? Put your feet on the console.
I skipped the drawer system, no flexibility, I like to be able to change things around depending on the 'job'. I use the space under the deck for the spare, a tote with all my spare fluids/hoses/parts, jack, tool bag and recovery stuff. Tote tubs are great because you can fit a gallon size jug in them and be able to Just pull the whole thing out at once. I also like the dog guard for packing stuff to the ceiling in the back. If you had the back seat out you could have the dog guard fold down to be the other haif of the bed and store your clothes and food under the bed or fold the guard flat against the spare tire deck in the way back to keep it out of way when not in use. You would have to have little legs or some thing to prop the bed up.
Good luck,
Pad