Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Given all your requirements, I might make up a couple test panels to see if the following leaves a flat result.
With the 1/2" and 3/4" 1/8" wider than final I'd glue them together with white or yellow glue and brads, keeping the common edge reasonably aligned. After the glue dries for a couple hours I'd trim the common edge to final width on the table saw.
I don't see a production approach to gluing the veneer on the 1 1/4" edge, or a way to vacuum bag the edge without a lot of checking and adjusting and drawing the vacuum in stages. And I wouldn't want to repeatedly mix up a dab of urea formaldehyde adhesive and veneer another edge. If it's not going to be subject to handling and wear, you might consider using white or yellow glue, cauls and clamps. Whatever adhesive you use on this exposed MDF core, you might consider brushing on a fairly wet coat, wait 5 minutes for it to be absorbed, and brush on a second coat and veneer.
After the glue cures and the veneer is trimmed, you can vacuum bag both sides of the 1/2" MDF at the same time. The distributor likely has some sort of backer grade paperbacked for the back side that will cost less than the show veneer.
Be sure to make a couple sample panels and some test destruction to evaluate, and a dry run or two before breaking out the adhesive.
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