Yep, its a cut and weld process. You cut off what you don't need, and weld on the new stuff.

I didn't read the article, and don't intend to, there is nothing about a Vette that interests me.I would probably go towards a modern Charger suspension over a Vette anything.

Straight and true are always the 1st concerns. Finished ride height is the next challenge. The Plymouth frame sits up pretty high off the ground, the Corvette frame sits a lot lower then the Vette frame, you may end up placing the Plymouth frame on top of the Vette frame to get a serviceable driver, but if you are using both the front and the rear Vette frame sections that support the Vette suspension, you may be better off the just extend the length of the Vette frame. Then all you need to be concerned about would be how to attach the Plymouth to the Vette frame. They are very different.