I'm well aware of the limitations when attempting to MIG weld aluminum even with the proper set up, but thanks for the heads up. I think I will mainly stick with steel
The bike may be on the heavy end, but who cares? If it's fun to build and fun to ride, than I would consider it a success.
Now, on that Bottom Bracket Shell, I've found a few around but most are al, does anyone know of any sources in the states (that top link was excellent, but it was in the UK) that I could purchase a steel BB from. Standard threading, etc, etc.
Thanks for all the input and responses
thus far!