I'm really digging those seats @White Stripe! I've always thought of doing something similar with the 3rd row seats from the FJ80s. I think what you did here though is really nice. you have pics when they're both folded up?
I have 3 kids so needed 3 belts at times. I made the 80 3rd row seats work but really they are too wide. I cut out the wheel wells to fit them. Spring over allows it for tire clearance.