I've been running the same question through my head since I bought the plans.
Initially I am going to attempt the build myself even though I have no experience with engines. I read the plans many times. I've watched the videos, purchased a book on VW engines, and watched anything I could find on YouTube. I bought an engine some time ago and dis-assemble it. Learned a lot in the process. Turns out the case was no good so I tossed it. Will attempt the same thing again. I like the idea of an inexpensive engine and like most of the people in this forum, I love to tinker. Some parts will be purchased, some parts with be refurbished and recycled.
Then after hundreds of hours and thousands of $$ of tinkering, I will probably end up buying an engine from Scott Casler.
Vin