I've spent the last couple of days putting insulation, a headliner (still need to trim/finish it and prototyping a bed layout out of some scrap wood, before I do the put in in with aluminum. A swing down table will cover the gap and push to the passenger side when up, with the mattress section goin across the front, when done.
(ARE aluminum DCU with windoors and barn doors/tailgate replacement)

*) Aisle too wide, you think?
*) The barn doors are not full open, so I'm a bitt puzzled on easy "slide out" access to the underbed rear portions. Maybe a slide out table down the middle, to pull out?
*) Other advice??