I always wanted to try explosion forming...lol....my tig welding is also very poor...sometimes it looks OK and sometimes its all black.....
I did use a wood form to change the curve on my fender flairs that I have been working on slowly....but only the end of a 2x4....
One of the local hobby shops claims they have the ability to scan to make a file that controls their CNC wood carver.
I am thinking about having that done so I can make some final adjustments to my metal flairs.