Stan was just talking about "a Model T replica" above. Greg is kind of doing this. He makes what people want, in typical color combos, then sends them to Roy who sells them. You know, the OE look narrow-body cars that sell easily and for good money.
When I was considering building a coupe, I spoke to Greg. I simply wanted a better suspension, not on a pan. Greg wasn't ready to replace the pan/suspension. Greg doesn't have a world-class chassis designer on staff.
Carey hadn't started his coupe journey yet. But Carey happens to have Chuck Beck, one of the most talented engineers/chassis designers out there.
This was all before Greg started building Speedsters(and then moved back to Hawaiian Gardens), so a while ago. He was crazy busy then, crazier busy now.
I don't know for sure, but I think that the Vintage Spyder mold changes were done when the old molds were simply worn out, and new ones were needed.
Stan is right: there is no good time to make changes. You make small evolutionary changes as you go, just like Porsche does.