John,
This looks good. Here are my observations/suggestions about this design:
1) You would probably need a total of 4 Fastrack Transition pieces in between the Gargraves switches and the Fastrack track on the outer loop.
2) If using the the GG #801 track mating pins, you wouldn't don't need FasTrack transition pieces at the top inner loop where the GG switches connect to the Menards tubular track.
3) On the lower spur, there are two LH O54 switches superimposed, one over top of the other, which would make the parts list count one over what's needed.
