Hoff,
Your bait looks interesting.
I've laminated PVC decking to PVC trimboard in the past, but, for me, it wasn't worth the effort.
I hand shape all my baits, and, even though I get close, they all vary by the time I'm ready to add ballast to them. For smaller cranks, it is possible to repeat a shape well enough to be able to use weighted belly hook hangers to get close, but I have trouble getting bigger baits that close.
I've found that I have to play around with my ballast too much after my bait is shaped, depending on the shape, to be able to incorporate the ballast before shaping.
Please keep us informed as you build them.