Trunk gap problem after new 1/4's

back in the day no one would go into the door or trunk openings you cut and flange back from them if possible because it is time consuming making it work otherwise. That said though it isnt impossible its sounds like the welder didnt spend the time getting it right.
The Cats I know, don't let the welder hang metal...., unless it's Big Al. But he Will Not work behind anyone else.... he's Bad Man, Super Bad! I'll take some pics next ti.e I'm out that way and start a thread. He's almost finished with his childhood 68 Coronet... base clear black, Slightly tubbed.... just sick...