Update from my project. Sorted the top (I'm splitting the build into "top", "sides", and "back" in my head) and love the black Sunbrella Seamark fabric recommended by Sailrite (
http://www.sailrite.com/SeaMark-Black-60#.U06QZo1wrzg). Canvas outside, treated inside, no scent, 100% waterproof and very pliable and easy to work with. Certainly a little more expensive than remnant canvas or similar but I'm trying to build this top for the long haul.
Beyond the fabric, I have had some issues using 3/8" cord/rope for the channels. Good news is that it's cheap and easy to work with. Bad news is that no matter how tightly you sew it into the fabric channel attached to the top, it inevitably has some movement once you start working the top into the metal channel on the truck. So as/when it starts to bunch up, it makes installing the top trickier. I haven't decided, but I may try to source some of the rubber fender welting discussed in posts #200-#203 or go with some of the 2/8" coated cabling from Sailrite (
http://www.sailrite.com/Wire-Rope-1-8-Wire-Coated-to-5-32#.U06RMY1wrzg) and replace rope channels.
Three more thoughts as I continue the build:
1) In looking at the top, it seems to be begging for glass panels that run side to side OR front to back (I'm using 30 gauge Strataglass -
http://www.sailrite.com/Strataglass-30-Gauge-Vinyl-54-x-110#.U06RsI1wrzg) to create the equivalent of a moonroof/sunroof. I imagine the reason I don't see this more is that even with careful installation, in a heavy rain you might get seepage at the edges. I'm going to investigate the possibility of using some kind of epoxy at the edges 'cause I think that having clear panels would be awesome.
2) In installing the top, it seems natural that with some planning, you could create a bimini top AND the full top. Here's what I mean: you could create a top panel that could live on its own but then when/as necessary, the sides could be installed and the back as well. The caution would be that with some kind of temporary installation method (velcro, straps, etc.) to facilitate the modularity of the top, it might be noisier/less stable at higher speeds. But since I don't ever imagine driving this BJ44 down the Long Island Expressway at 70 mph, I'm not sure it's a real concern.
3) When I get to installing the side panel glass/windows, I think I'm going to try and line up the height with the door windows. While two shorter windows are obviously more of a classic look, I think that one larger window aligned with the two door windows will look great aesthetically and provide improved visibility for driver and passengers alike.
That's it for now. Between work and family stuff for the next few weekends, I won't back at this project but will report when I pick it back up.
As always, thanks to Ant and everyone else on this thread for the inspiration.
Best,
Evan