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Dude, it doesn't cost $500. I just took the parts from 4 different scooters and a Kymco 50cc  with a seized engine. I built a gy6 150cc engine from 3 different motors. (The guts out of a REALLY smooth running X-pro into a no name case that someone had disassembled and never put it back together with a complete transmission and a cylinder head I bought new with a small combustion chamber supposedly for a 125cc  and did a port and polish job on it. I've had it on 3 different engines and you can really feel the difference in power output). Anyways, I built the whole bike with only  about $50 invested in it TOTAL. I had only basic hand tools and did it in my carport in 4 days, welding and everything. That's what i love about these Chinese scooters. There are so many around that parts are usually free just for hauling them out of someone's back yard. 
  You are correct though, you have to get the mounts welded in exactly right or you'll have a crooked bike and those are not fun to ride. Exciting maybe, but not fun. 
  Everybody thinks you can just buy a solution ready made and it will make it easier or more cost effective. It's easy, watch a YouBoob video of some dude in Denver install this really cool kit that has everything you need but is a little pricy. Guess what? This same dude is the one selling the kit. He's been a mechanic for years and makes it look easy. So you order said kit and it just goes downhill fast. I'm the guy that buys your "project bike" or find it at the scrapyard for basically free after you get frustrated with the opposite of an easy build. A lot of people will try throwing more money at it and only get more frustration. 
  4 days though. And that includes a complete engine rebuild, motor mounts, hunting for parts, the kids wanting to know what I'm doing and a vocal woman who doesn't want to park in the sun and will tell me about it at every possible opportunity. With a total of maybe $50 in the parts bikes AND rebuild kit (gaskets, seals, piston & rings) with no special tools, hoists, engine stands, or even air conditioning. You don't have to spend a ton of money to have a fun scooter. A 50cc to  150cc swap is pretty easy. If its Chinese bikes then you usually don't even have go change the wiring. If you get the engine in there straight you'll have a rocket ship.