RE: American rippled PVC and Canadian pipe
Funny you should ask about the 3 1/2" square rippled pvc downspout pipe....anyway I'm guessing that is the stuff you are talking about here. I'm currently in the process of building a coro cap232 clone of some sort using the rippled pipe as the fuse formers. I've got the fuse glued up and the tailfeathers cut out but need to install the horizontal yet. I'll post a few pics of this creation if my picture host ever gets their server back online.
Madd_Maxx