I have a stalled project which is a combination of the standard 56 Nomad and an original 56 California Wheels sedan. I wanted the lower stance from the sedan (before they issued a Nomad version).
A plus is the sedan has a revised bumper mount which fixes the problem. I think it should be relatively easy to modify the Nomad parts, especially if you have a sedan as reference........
I will get back to that ....one day!