in my car (see the online pic in sig. , not sure if they still work??) I have a patch panel on one rear qtr...a "drivers" paint job....paid $2500 for it , single stage paint....done 10 yrs ago...still looks the same....it was born as a 350, now 400, and cloned w the exception of the front bumper ,the "arrowhaed" isnt there (what you called inverted V), I made that part of cloning that way so it wasnt supposed to be presented as a true 400.
It seems like you dont "need" to to a frame off resto, if it rumns good , looks good , just enjoy it!
ok my sig doesnt work .....I`ll post a pic in "ramblings" for you