Dave-
I thought that one through already about mounting the RossBed later. No way to join the track with it on unless you compromise its shape. I picture using a small rubber mallet carefully after all the track is assembled. I did assemble two Ross long straights with RossBed to do a test on my Hellgate Bridge. I removed the bed by carefully using a new pencil on the eraser end to ease the bed off the track. Steve makes sure that stuff fits tight, no slop at all.
Peter-
Thanks again for the heads up about the base coat of primer. I am having trouble finding it though, none here on LI, at least at HD according to them, and not even any in Conn. I scored seven more cans of the Stone Gray today from Walmart.com, $8.93/can. That's better than the $13.03/can on Amazon. I got sixteen 14.5" straights done out of one can of primer, I'm keeping track of the usage. What is your trackplan software?