My 2¢. You are very lucky to have an E body Now. The thing about an E body is it has style. That more than likely won't go out of style to soon. Every one that had or has parts knows it. The parts have been horded over the decades with hopes and dreams of having one one day.
Having a Ebody is a disease,I mean a hobby now. I takes more money then what house dose to fix up. I have 3 and 2 garages. Seemed like I just keep spending wads of cash to fix them up. And keep them
You just have to deiced where to draw the line and be happy. I have learned from my father a few things that helped me. 1 A little bit at a time will get a lot done in the long run. 1/2 to an hour a day get something done. make the time.
2 If you don't have it make it. He was so right about that. Everyone is so spoiled now! They just want to buy it. As far as your project keep every thing until your done. A rusted piece of scrap can be what you are looking for. It's a template. I showed my son that and know he get the hammer out and makes it. He really wants the hammer of mine that he uses. Tin knockers hammer. I have bought cars that were piles of scrap. The first thing I ask. Is every thing there. I don't care if it's broken,bent,twisted or rusted beyond repair. I know what I need to make.
Now these day you can take a template to a tin shop and at least cut what you want if not even make it.
So if you have an, How do I say it, older guy or experienced handy man what ever man. Just listen what they have to say. If any thing get a tin can and see what you can do. Even a plastic milk jug or poster board make a temp let.The only thing you have to gain is experience.
Quit bruiting you have an E body! Don't let it go this far.
You don't have to have the best of everything. Make the best of what you have.