Went by super fast but I did have a VW tech and a guy who's built 5 or 6 of these. I can't claim any measure of success til it's in the car running, but we all learned something. My tech has never built an ea888 from a bare short block (dealers usually just re-ring or send out for a new assembled long block). Mike hadn't built a 19+ motor (slight differences in the balance shafts, upper oil pan, etc.
#1 thing that helped was organizing everything that came out of the old motor and labeling it. And I mean _everything_, you never knew when you might need to re-use a bolt that disappeared and you've got RTV curing and the nearest dealer with one is a 2 hour drive away and they close in an hour.
Unfortunately when you assemble it in a clean garage then quickly move everything back to the home garage, things get misplaced. Especially when you've got 3 guys all working out of 7 totes full of old/new parts. I'd have felt better seeing every seal and bolt go in, but unfortunately as the least-skilled contributor, I was the designated go-fer and spent a good bit of time at harbor freight and home depot.
While I wait on a turbo for break-in, there's a few things I'm going to go back and re-do. I didn't have a new oil cooler or a gasket for it. Bad spot to develop a leak. Also discovered that my new FCP thermostat housing was broken in the box, but that's gotta come out to do the oil cooler anyhow. The bolts I ordered for the camshaft and crankshaft position sensors weren't correct and were re-used. Both easy to do later on if it's a problem. Not entirely sure if we put the strainer on the oil pump (separate from the pickup itself), so might have an excuse to pull the pan and helicoil the upper oil pan threads.
Feeling great about it though, building a motor with some VW buds is a fantastic way to spend a long weekend.