Thanks everyone for the quick responses.

Maybe I'm over planning it but when I order the set, I want to order all the additional track I need.  I would like it to look uniform (same distance from the edge of the shelf) going all the way around the wall so measuring out the widths of the track and cushion, I think, would be important. 

Has anyone made a shelf layout where you mount the shelf about 10" or so from the ceiling?  Is that a decent distance from the ceiling?  Also, how far from the edge of the shelf do you mount the track?  0.5"? 1.0"? 

My current design has a 6.5" shelf (and in order from the wall towards the center of the room) where:
0.5" is a LED rope light
1.5" cushion
3.5" Fastrack
1.0" cushion

Or would it make more sense to have the train closer to the edge of the shelf, say 0.5" cushion (replacing the last 1.0" cushion, or the edge closer to the center of the room)?

I'm going to put together a YouTube video of the install and complete project and will post it once I'm done.  (It may be in the new year!)

Many thanks!