There isn't anything local, or at least in reasonable driving distance from you? I couldn't fathom having a motor built for me a place on the other side of the country. Maybe I'm spoiled though living outside of Detroit.
Where the motor is built would be the very least of my concerns. In the whole scheme of things, paying to get the finished product shipped to you is insignificant in the cost of the build.
First motor i ever had built was by Hensley in Knoxville Tennessee. I never saw the motor until it arrived at my door on a pallet, i live in Mi.
Find somebody reputable, and let them build it.
I have already mention two such places already in this thread, that i have personal experience with
