Good job on the trellis, Greg; thanks for sharing your project with us!
(I personally think that one can never have too many places to grow climbing plants on...)
One concern may be that the PVC will break down fairly quickly from UV rays, unless it's a certain type -- "schedule" something or other, I believe it's gray in color. Or, painting the white kind will help protect it too, so you may want to reconsider doing the red paint
@microb, if you're thinking of building a PVC greenhouse, here's a link to an article about constructing a simple one:
http://garden.org/ideas/view/B...
There's also a "garden structures" forum here that might have some other ideas for you.
