'67 Cuda rear fold down door... Help?

Mine was a rotted mess as well, with speaker holes.
I used 3/4 plywood with one side finished, and traced the old one on it.
All of the hardware was usable, except the screws holding the latch on were too short, I used longer nut/bolt/washer.

I then stained it on all sides with black wood stain- no more rot!