knowing what you know now what would you have done different.

Well, for the auto point of view for this post....
I should not have thrown away a beautiful push-button dash, just because of some toasted wiring.
I should not have thrown away a perfectly good 60/40 bench seat
I should not have thrown away a perfectly good, unreproduced, crack-free speaker grill, just cause i wanted to replace it with a switch and guage panel.
I should not have put a roll cage in a car that just barely needed one.
I should have fixed the horrible paint under the hood, instead of just stabbing in a motor so i could play.
Edit: this is just the begining, the list goes on.....and on.......and on.........