Mark,
There will be no hard feelings no matter which way you go, these are just to give you options to consider and give me something to do on a lazy Sunday. Believe me, these samples are not taking more than 10-20 minutes to modify, so I'm not expending a lot of effort and I'm doing it all while watching TiVo recordings of DIY and HGTV. What they need is a TTN-TV channel (Toy Train Network-TV).
Here is another version with an area for a town in the original turntable location. The elevation of the existing turntable section was raised to 7" and that increased the grade to 3.9%, so there is still room to elevate the turntable section even more if you want a steeper grade.