The doors are about 17" wide and the firewall is about 37" at it's widest point.
The original build sheet written by the guy who first put this rod together in Brooklyn, NY listed a '23 pickup as the donor body and frame, front axle off a '48 pickup.

I don't have his name on the list. It's hand written and lists what he used. the original steering box (retained) and column as well as the master cylinder were from a '62 Falcon but I installed a dual master for safety.

Working with steel body made it impossible to get a new gate that fit (had to do a lot of mods) and I still need to get some hinge(s) for the cowl vent which I have but is not shown. Any ideas?