Help fill holes in Trunk lid

Not everyone can afford to do that. And / or he may want to do it himself. I am not suggesting that he slap Bondo and fiberglass over rust holes. And I hardly think that doing a repair like this will turn his car into a parts car. That is a bit of an exaggeration. I have owned the 69 Barracuda I have now for about 30 years. When I restored it the first time, about 28 years ago, I did not have a welder, so I fixed several places as described above. After 20 years, the lacquer paint job started to show its age so I blew it apart a few years ago and painted it with modern base clear. All of the places I had carefully repaired 20 years earlier with All Metal were still intact and holding up fine. It may not be the "right" way to fix it, but it will certainly work, and it won't make his car a parts car.
I had 4 holes about that size on my jeep tailgate welded up 2 years ago, 100 bucks.