An interesting challenge. Not a lot to find web searching. I found one, Train-O-Rama, in Ohio, that has O & S. At 1:38 in this video, you can get a look at their approach.
Blending the scenery to connect the two "worlds" would seem to be a good way to make them work. When I think of wedding cake styles, it's just not that appealing.
Can you fit two 4 x 8's in an L shape?
Thanks for the reply Carl and the video. 50 trains running at once, wow!
Not sure if I could do the L shape, I would have to rearrange other items in the room.
Thank you for your time, Ron.
I was observing the scenery transitions with the mixing of gauges. I think we could all enjoy a nice size building for our layout.
First a comparison shot. The a concept photo of the L with a mountain as the transition.