Fakes into real splits

So I just picked these up cheap from a local classified. Still no idea what they are, aside from being manufactured in 1988.

14x6, et40-something, 5x100. Hardly aggressive, but cool wheels nonetheless, especially when I noticed the centers and barrels are separate pieces that were welded together later. I got the idea they'd be perfect candidates for converting to real multi-piece wheels and eventually mounting to my '73 Benz.

I have access to a lathe, drill press, and Bridgeport milling machine, along with several engineer friends who are quite excited to help out with the project. I've read through a few writeups of similar projects, and I know a few things to look out for, so I figure I might as well have a little fun and give it a shot.

What I'm having trouble with is sourcing parts and pieces. Whether I decide to go for two-piece wheels (purchasing complete barrels) or 3-piece (separate lip and barrel), I'm not sure where to look as far as finding lips/barrels with compatible bolt holes. The wheel center is 13-3/8" diameter, with 20 holes, each 1-7/8" apart center-to-center, and 12-1/4" center-to-center across the face of the wheel. I've also considered stepping up from 14" to 15" if that's possible.

If anyone who has done such a project can chime in with resources or pointers, I'd appreciate all the help I can get.

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Fakes into real splits