My RV-12 is based at Sky Manor, finished it 5 years ago this week. Send me a private message if you need questions answered ect... more than willing to spare some time for another local builder.
As for transition training, John Albury outside of Dallas did mine (along with many other RV-12 pilots on here). Well worth the trip down there. Dave Farmer on here is a good CFI who flys an RV-12 he built, based in Maryland, who might be willing as well.