Wow! Lots of questions, I'll try and hit em up in order.
@seeker333 - 18"
@Bekologist - Just over 6' and 18" frame
@Barrettscv - Yep! The 25.4 version.
@aroundoz - I'll definitely be providing a ride update. If the weather holds up I'm going to take it on a short overnight in So Cal just after Christmas. As far as tires are concerned I'm going to move to something a bit more street friendly. When I get to that point I may solicit some opinions. I've had great luck with Schwalbes, so I'll probably look there first.
@TenThousandSuns - I believe frames are available, but I ended up buying a complete. I had the bars/levers/etc switched out to make it a little more long-haul friendly. As far as measurements, I don't have my info in front of me, but I'm just over 6'. The frame ended up being an 18". If you're interested in more accurate measurements, I can dredge them up when I head home from the office.
@enigmaT120 - Two main differences made the choice for me, though YMMV. First and foremost, rear facing dropouts (or track ends, kinda). I planned on this being my "do everything" bike so I wanted to leave the option open to easily run it as a SS MTB. How this plays out when I get my first flat with fenders and racks installed is still up in the air, but I imagine it won't be too onerous. Second, the cluster of eyelets and mounting points leaves open the option to run a Rohloff hub in the future (without an adapter plate) and the canti bosses should make it easier to mount the Old Man Mountain racks that I currently have planned.
I'll provide an update as soon as I can pry myself away from the office for more than a day