Cool ! I'll be watching this space.
Btw, about the firewall ; did you cut out the original piece and weld in flat steel, and what are your plans for heating, ventilation and air-conditioning ? Vintage Air ? I'm happy with my Vintage Air system.
The front seats may work, but remember the driveshaft & transmission tunnel of the A-body is offset slightly to the right, so there's less room for the right-side seat. From your pictures it seems the rear seat you've selected won't work. If I may be so bold as to suggest you widen the rear wheel wells now (for 10.5" wheels, but this also requires a switch away from cart-springs) and rework the original rear seat frame and have it professionally recovered to match the fronts ? This is what I did.
