12 volts, regulator on the the generator?

[cas3]

in my junk pile i found a early style generator with the fan mount pulley, that has a two brush 50's style rear case. i know thats a trick folks have done, but this one appears to be a factory made deal made by dixie co in toronto and its 12 volts. i'm normally a 6v guy, but since its here i thought i would play with it. my idea is if it had a small voltage regulator mounted right on the case like the cutout was, then there would be no change to the wire harness, and i would not have the big ugly regulator on the firewall (34 tudor) . this thought came from the early vw's that had a cute little bosch unit mounted on the generator. investigation now tells me those were 6v, and later bugs that were 12v had the regulator under the back seat, then later yet its a solid state thing. now, i'm not stuck on vw's, thats just what came to mind as it was an nice small unit that would not look so out of place. i googled up every thing here and on hamb and it seems no one has done this, or i didnt find it any way, any ideas from you folks here? thanks, skip