[flaflier]

Reminds me of the bimini top I had on my CJ-5. The CJ however, had 1 continuous horizontal roll bar to support the top. Maybe you could sew a 1/2" PVC pipe or something into the back end to give the back some rigidity, so it doesn't sag between the roll bars.
Living in Florida, I understand why, it's F*&#ing hot!

Interesting idea, though...

Jim