I have been wanting to get into some larger stuff engine, and boiler wise, so I think I'll need some larger diameter copper pipe, upwards from about 3" or 80mm, and also the thick gauge (about 3mm) stuff apparently required by AMBSC codes for miniature railway locos. (I'm not building one yet, though.) Could anyone point me to a source of this stuff? The plumbing shops sell 100mm copper pipe, but only in 5 metre lengths! I'll also grab any bits I see at the scrapyard that look useable, but I doubt I will find the thick gauge stuff in either of those places. So you know, I live in Australia.