I wish there was more of an interchange and swap guide that could be used for mopeds. Handlebar parts and taillights seem to all be the same, but I've been looking for pistons that are larger than 38mm for the sachs. I though it would be easy, because the sachs dosn't have any vents or holes in it.
As for hobbies- I have done 1/24 and 1/25 scale cars for a long time. I'm really into the 50's "kustoms" and can chop, channel and section anything. My latest is a 90's infinity that would have 5" tall windows if it were full scale.
I put a lot of that on hold for school. The model and detail experience really helped with the architectural models.
I do a little bit of electronics, and rigged up the thunderbird-style sequential taillights on my Buick. Acutally the buick is kind of a hobby too.... either 200,000 or 300,000 miles on the original block. I've had it for 10 years and flipped over the odometer twice. It's my first and still only car.
I accidently got into motorcycles too, mostly because I've had NO luck finding mopeds.... Now I have a 1980 KZ440B, a 1982 AR-80 and 2 1969 honda sl 350's.
I think that you have to be detail-oriented for a moped, just because there is so little to it.