Joe,
First, the track mating. The FasTrack, 6-12040, converts FasTrack connectors to O tubular style pins. Then one would adjust for rail height on the track being transitioned to. I looks like that would necessitate cutting the locking tabs off of the Super Snap.
I viewed the project as two separate loops of two different tracks types.
On the three layouts that found - the first two have compound curves of multiple diameters and more switches as you can see. You can contact him for a track count list if you want to explore those.
I think something like T-Mack's approach would look nice with your inventory. The Super Snap would look great on trestles. Then, perhaps a small "mountain area" in one corner or maybe two. That train could be moving people from one place to another or moving a commodity like granite or logs.
That would the FastTrack for the base level.
You have enough FasTrack for the Dealer Display layout, it would have space for buildings, but it would not permit enough space for another line of Super Snap.
So, I am still pondering some ideas.
You past layout was a good use of your inventory. I liked it.
