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@Dutch_Cheese
I couldn't find nice chain guides and the ones I already have (FSA carbon, T.A. aluminium) are too modern for the Alan bike. And I have no period correct 130mm BCD cranks.
But I found some usable 144mm BCD Sugino chain rings that would make a nice combination with the Sugino cranks that I already had.
I am going to use the 2 52T rings as chain guides and run the 48T ring. For proper function and appearance, 44T or 46T would be a lot better, but this must be it for the moment.
First, I used a electric jig saw with metal blade to cut the teeth from the 52 rings, using the transition from ring to teeth as a guide.
Then, smoothened the cut edges with a file and finished it with sandpaper (strips, cloth backed) and very fine steel wool.
It's not perfectly round and the finish is not superb, but I'm quite happy with the result.
I have no direct access to a turning machine. That is the classic method to make guides like this. But the trick with the jig saw works fine.