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Another way of doing a "home-brew" version of this cap might be to build a lightweight (aluminum?) frame and covering it with shrinkable plastic.
Do you think the material from those "window insulation kits" would be durable enough? You can buy those cheap at the end of every winter. Being clear, they wouldn't restrict visuals at all. Wouldn't be good for locking things up in the back of the truck the way a hard top can, but we are speaking aerodynamics here..
Otherwise, how about the shrink material used for model airplane wings? It's sturdier and comes in different colors. I am not sure about the expense or the size that material is available in.
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