What is your plan for the rear seat? I only ask because it seems like you would want to run the wheel wells further up and have more room in the rear. Although, it would also be a great spot to add some custom storage boxes with the extra space! As it sits, with the seat in the stock location to the foot well, you will have a lot of space on each side of the seat. Maybe you have room for a third seat from something like a Suburban? That could be set up to fold down, and use the quick release floor mounting. If you have room for that seat, you can bump seating up to 5! I happen to have a Suburban with this seat if you want some measurements.
Anyway, really slick work! I love seeing something done like this and not look hacked!