Yeah, I took all my measurements off a screen used prop. In fact, had two under my nose that were pretty close to the same dimensions. They still had nails hanging out of the wood where the velcro was.
Don't forget that a faux view screen was built up over a stunt to hold a slide for the hero close-up. Gave the prop a little more personality too. Well, as much as you can for such a utilitarian piece. Rich has some great pics on his site of an original, too. Lots of info here:
The guy who "commissioned" me to build six belts, bailed on me after I bought all the materials. Just as well, I couldn't get a hold of any of the belt beads/buttons. I'll have to have them made again.