Well there you have it, all built up. I think I should have gone with a horizontal top tube. For some reason it just doesn't look good to me. Like I said it's an experiment. I took it out for a little ride this afternoon. It's very stiff, but what do you expect from 035"/.9mm straight gauge 4130. Tommorow I'm going to go out for a 30 milers and should tell me a little more than the 2 miles I rode it today.
The experience has taught me a lot about how to go about it next time. The split seat tube consumed a lot of braze (4 Sticks!) and extra time and weight. I'm going to build a single speed 29r and use this method to give it short chainstays.