Scott, I'd be happy to send you some detail pictures of mine with idea's to improve the setup. I started out just the opposite from you, I built the cutting head first and now slowly getting the track system created. I just wanted to have a little proof-of-concept first before jumping in with both feet.
I'm creating a semi perminant set of tracks out of 4"x18' cast iron water pipes left over from a construction site. They are super rigid and HEAVY. I'm going to bolt a couple of angle pieces to align them and then used RR ties to support the logs.
It's been too rainy and wet here the last month to do anything that's not on solid pavement.
gary