I don't think I'd go with brass, either. You should probably switch everything out for stainless steel. You know, just to be on the safe side, and since you want this to last 150,000 years and all...
I think these words say it best: **** off!
Besides, so much SS comes from china now. And for some reason the Chinese seem to use lead in everything. So god knows what really in their stainless steal.