Master Fabber
+1y
What I do is just locate the cab and bed on the new framw and center it where everything thing is perfect(wheel base, side measurements) and then just build new mounts in that location. This works good in some instances too where moving the cab back a hair is not a bad idea(s10, etc.)If you were jigged you would be stuck with the original mounting spots. There needs to be some form of tubing that holds the cab and frame at the same height though.