Dude that's awesome. I was gonna use my trombone mouthpeice to make on one day but then I just ended up smoking out of one of my friend's pipes, getting really stoned, and completely forgetting to make it...
we used to always make bongs using trumpet mouthpieces. they worked great with pretty much anything. i dunno about the whole lead thing tho...i played drums myself
trumpet mouthpieces are made from brass. that has been coated in stainless, silver, or gold. Mines gold so I don't think I'll be smoking out of it any time soon.