After squaring and leveling the donor frame from Bill Wilson, I set a Datum at the original Axle centerline. Then Taking careful measurements I can construct a representation in Alibre’.Added the rear half of the frame from previous. Also changed the way the bumpout for the core support works. Not technically correct but works with my software.Locating all the critical holes needed for current and future projects.Alibre’ 12 isn’t as sophisticated as it could have been. Doing a mirror of the Right frame rail wasn’t as easy as a command. I had to re-generate each sweep, boss, and cut the opposite way to generate the Left side rail.Tried an approximation of the stock transmission crossmember. I may go back and re-draw it. Added the rear body mount crossmember and gussets as well as the forward crossmember for supporting the rear springs.Very similar to the 61-64 kits, this one requires a taller boxing plate and different locating holes. The longer boxing plates should solve the problem of the long and unsupported front frame section once the stock Twin-I-Beam crossmember has been removed.