Ohh. You mean you actually want to build a road legal moped, taxed, tested and insured?
There's an e book for a tenner or something. I think it might be available on eBay. It details the parts that you have to build the bike from. I don't know if you can ever pass emissions tests with the generic Chinese 2-stroke.
Pretty sure there's no more limited, difficult, and expensive motorised transport though lol. For instance there's only
one set of tyres I think, and lots of far-too-heavy motorcycle parts needed.
If I could get a driver's licence and insurance I would just buy a car or a light motorcycle, or just buy a passport and leave!
Edit: sorry I went off on a rant there! I don't think that the legal motorcycle parts are better motored bicycle parts at all, personally. I really like the off-road bike I'm slowly building up.