35 & first half of 36 cabs were tall with a flat back & top and had a lot of wood inside. They had 3 hinges for the door. The last half 36 had a rounded top, 2 hinges and only 3 pieces of wood -- apiece behind the dash and one in each "A" pillar. I'm not familiar with the 37 but have heard there are differences--
KC Wood has wood kits( all precut and drilled). Pertty expensive but it will take a LOT of work to make your own.
Good luck.