How to make PVC perches on a tub?

I have a couple of GTP's that are ready for an upgrade in tubs. I'd like to make removable perches but i'm not exactly sure how. Can anyone here link me to a guide or forum post that shows people how to make one?

I would use coat hanger rods. (found at wal-mart) and cut one in half. Silicone the bottoms to keep the perch from sliding when you add it later. Then attach to tub however you'd like.