I spent some time researching 29er and touring geometries and I think I've come up with a nice blend for this frame. The next step was deciding on parts, disc vs. cantis, and other bits. I finally settled on canti's and also found a slick way to use Campy long slot dropouts so this bike could be run as a single speed. In fact, I plan to display it at the NAHBS that way.
OK, here's the frame and fork.
I love the shape of the Pacenti fork crown, plus it allows for the classic raked fork. If you look under the crown you'll see my tricky fender mount. I may not use it often, but it'll come in handy if I ever need it. I also added rack mounts for versatility if I ever tour on this bike.
I wanted to have as much clearance for fat mountain tires as I could get. I mocked up the chain stays and spent some time deciding exactly how wide I could go. The seat stays are 16mm double tapers that I custom bent. I also made a small bending fixture for my seat stay and chain stay bridges, both of which also have fender mounts.
Fillet bottom bracket, always a joy to finish... I also added the little cable guide under the chain stay to get the cable past the bend without snagging on the knobbies.
Here's the retro dropouts. I sized the chain stays so a 2.3 tire just drops out before hitting the seat tube. I also made sure the slot was as close to perpendicular to the seat stays as possible. Now when the wheel is moved back and forth in the slot it doesn't affect the brake pad position. Finally, I modified a Surly Tuggnut to tension the wheel with these dropouts. The screw countersinks into the existing hole on the Campy dropouts.