Hurrac,
Good solution to repurpose stuff you already have.
I bought one of the Austrian AC generators and I really like it. The extra 4mm pulleys are very nice as well. What I like is the old time feel to it.
However, I will be putting on a Meccano 3 step cone pulley on it. Like all dynamo steam engine combinations, they are sensitive to gearing. Hence why he includes the 3 pulleys. For permanent display his pulleys are best as you can have 2 belts on them similar to a full size setup.