Here's my question about that... what's the line between light touring and loaded touring? I've done a number of 1500 km bike trips, but I pack light and don't think I'd ever see myself traveling with more than 30-40lbs of gear and even that is pushing it. But yes, it would be so much fun to build it and both those Soma bikes look great. I'm not as keen on the dedicated touring bike frames like the Saga because at both ends of my commute I need to carry my bike up stairs and through several sets of doors and do the awkward "hold the door with one hand, hold the bike with the other, and try to fit through it without the door closing on your bike" thing. That might sound silly but I had a longer frame and found the back-end always getting slammed as the doors closed.

That's the bike! I think I've fixed the link as well.