A guy at work loaned me a Power Shear for cutting some steel and it works great, pretty much like a hot knife through butter. I was cutting straight lines in 20 ga and have not tried curves. The one I linked to is spendy and I saw an electric one in BB store for $50 s. They also make air operated.

Eric
http://s1199.photobucket.com/user/sparky234/library/My%2057%20Chevy%20Stepside?sort=3&page=1
'57 Chevy 3100 (Little Red)
'81 RD350 LC - Fun, Fun, Fun
'83 GS1100E - Pocket Rocket