i just made templates of the holes i wanted to shave out of cardboard...then traced those out to my metal( i believe that the guage is 18-20) its was pretty stout...and thicker than the actual firewall....As far as the wire channel...i made it in several pieces bending it over my knee to get the correct shape...it was also from the same metal...18-20....
Update.....well got most of all the driver side floor finished....just some finished welding and grinding to do ...And on the the passenger side....Also been tinkering with all the engine parts....cleaning and painting everything......and installed the dist and a Pete Jackson gear drive.........Hope to have all the engine parts and accessories on by the end of the week....Anyway here is a few pics......Tony