Custom Door Panel Help

[LowchevyII]

Can someone point me in the right direction with how to make custom door panels for my 70 nova? I love the look of the marquez and fesler stuff but 1100 dollars for door panels is a bit out of my league (not to mention they dont make it for my car anyway) and I would like something to keep me busy.

Do i use the original window felts? Do i make them out of foam then make a mold of it or something?

Any help would be greatly appreciated.

--Jeff