I have no idea about the hub question just to say that it looks like a nice bike and heck yes the Katy trail is dusty! I just moved to columbia and am on the Katy/MKT and it is dussssty.
I am not used to the hills yet. The trail is not bad at all, but the roads getting there and BACK especially are HORRENDOUS. If you can do that on a fixie, more power to you! You are my hero!