Dude, you are a man after my own heart!!!!!! barretaguy has a good point... about the corrosion..... the answer to that would be to anodize your aluminum body or just seal it with what ever will stick to aluminum.
A little while ago Rouge wich is owned by Fender (like Squier is owned by Fender) mass produced an aluminum Strat bodied guitar. So go for it!!!!!!!!!!!! As for sheilding.... just use some kind of thin rubber for an insulater. Good luck!!!!!!!!!!