Acid dip experience???

Well, I'm now retired and going to build my 1st car. I've learned to benefit from the successes and failures of others if I can. I'm excited at the amount of info on FABO and I appreciate you all sharing your knowledge. No subject is going to get 100% responses on one side or the other but this issue seems heavily favored towards no dip. I'm going to take that advice. I'm still curious about two other things. First, opinions on pros and cons of various methods of media blast and "normal" costs. Second, I removed the pot metal tail light bezels, lenses and gaskets. What I'm left with is a square, sheet metal structure that is spotted to the quarter among other things. It may actually be constructed of more than one piece. It's what the light assys bolt to. When I replace the 1/4 I'd like to replace this section also. Where do I find a replacement? Am I looking for a donor? All pics I've seen of 1/4's are from the side so I can't tell if it is part of the new panel or not. Lastly, who makes a quality spot weld cutter and how long can I expect one to last? Thanks to all who have replied. You have been more help than you know.