Thailand is the place to go for really unusual transplants and builds. Given the exchange rates, labor costs and the availability of Japanese powerplants and drivetrains, it's pretty much the center of the universe for this type of tuning.

Quality will vary of course, but there are very good shops. Japanese regulations don't allow "fixer uppers" on their roads, so a lot of otherwise good parts ends up being shipped throughout SE Asia. My favorite is a 190E with a Supra Twin Turbo engine with a Nissan Z car rearend handling the power and torque.