I seen this bed top before on Eastern Surplus and thought it was a pretty nice alternative to the soft top while not also weighing a lot. It seems like something that can be fabricated as well. The other good part is you keep your bed and still have more space than putting a container of some sort in the bed
.
That definitely has the look of being "home made". Not necessarily a bad thing. It sure couldn't leak any more than any other cover.
In days gone by, the company that I worked for had a small fleet of M37's for transporting workers to the jobsite. They needed covers and canvas just wasn't getting the job done. Limbs tended to rip holes in it and so on... ANYHOW, the solution was to put wooden 2x2's (approximately) in the holes where the canvas bows would go - and then cover that wood with CDX grade plywood, then cover that with sheet aluminum.
In this case, the bright red truck was just fine with a white baked aluminum "camper top" on the back. Might not be as appealing on a
piece of green iron though.
Couldn't find one with the back on it - but here is a bright red M37