I would not go from Crew to Single cab as that inside space is a wonderful thing....from anytime you randomly might want to bring someone, to easy access storage to who knows what.
same on increasing the wheelbase, maybe see what kind of interested space saving design you can come up with to save on the build cost & time.
The best way to get your better half back on board is to get the build done and out there. You can always figure out later what would be nice to have on version #2 but at least you would be camping and learning for yourself.
Too often we see mega builds that are never followed by trip reports...makes one wonder if the build became too much.
cigar smoking, wilderness first responding, ham talking night nurse who is overland certified and a fellow of the Royal Geographical Society.....
now everyone say "so what where have you been lately?"