I'm planning on taking the UBI course next summer. I'm pretty excited. You'll end up paying more than ordering one from, say Don Walker. It probably won't be as nice as a "real" Yamaguchi. But you'll be able to say that you built it with your own 2 hands. You'll have almost complete control over the design. And think about all the stuff you'll learn. That's the best part.
don't forget to budget for paint/powdercoat too. It's not included in either of the courses, I think.