Awesome..
You've gotten the bug back up and running for me now!
I dig how seeing other peoples projects lights the fire back under my ass.
I love the cover.. Whats the white materal you used to cover the PVC frame?
as for inbetween the cab and bed, use some of that foam insulation stuff made for water pipes and that mite help? Rollbar padding? Expansion foam?
I'm just the idea guy..
Rather they work is for the engineering department to figure out