T.W.
No doubt you figgered out that you stumbled onto a small pot o gold. Glom it up, m'man.
I share in your curiosity for PVC design. I think somewhere in the last couple of months there was a post (or perhaps an entire thread?) that discussed creating PVC trees...? The only thing I came up with is a very insightful thread with great words of structure wisdom:
Structure thread, 2002 You'll find some PVC stuff therein.