I picked up a Triumph Bonnie head from a guy for a screamin' deal since it had a broken fin on the bottom. Fully accesable for welding! Anyway, other than using a donor head for a fin, has anyone fabbed their own and TIGed it on? If so, what type of aluminum did you use? I have access to a lot of different aluminum and would like to utilize it instead of buying a head to cut up if possible.