Thanks F18, but this design has been used for along time by many others other then us, wish I could take the credit, but not our design.
As for the glue we used ZAP-A-GOO, this will hold anything on anything I think, got to be careful thou it might
distort/melt the plastic, it very strong glue, test it on scrap piece of plastic first. It takes a long while to dry, so you will not see any effects of distortion for a while.
Also
make sure you round the edges of the I-beam material so it won't snag on the box rail, it'll slide much easier that way.
this canopy project is very time consuming,[>:] but worth the effort.
I think that's why you do not see them that much.