Well first you take out the handles and cut out a piece of sheet metal to fit. When you take out the plastic handles you can see there is a little lip that you can rest the sheet metal on. Then weld it in all around. Run you hand across where the handle was to make sure there is no high spots and if there is tap it down a little. Then fill it with tiger hair fiberglass, sand it down, and cover it with bondo, and sand it. A longboard orbital sander makes it easier. Then coat with 2K primer.
As for door poppers, there is some info in this thread: http://www.bonnevilleclub.com/forum/...r=asc&start=20
The same weld in metal, fiberglass, bondo method, can be done with the trunk key hole too.
I thought about doing the inside lights on the trunk too or maybe doing 96+ outside lights and shaving the inside space to fit but it'* a lot of work. You'll need to weld thick sheet metal there and support it somehow.. Where you would have to support it from is a good 4 or more inches back too. Basically it'* herd to do without it ending up cracked.
I did work at a corporate Maaco for six months though. And I would not have attempted any bodywork without what I picked up from there.