I have some questions, forgive me if they've already been answered.
1. What is the layout height?
2. Magnetic uncoupling, or with a tool?
3. Unclear, Atlas flex track or sectional?
and a comment or two:
1. There are explicit and hidden (in turnout configurations) S curves. Those are a recipe for derailments.
2. Generally, automatic coupling and uncoupling can't be done on any kind of curve. See #2 above. Uncoupling can be done on a curve with a tool, but not coupling. I don't see a lot of places where you can do that.
Okay to answer the questions:
1. I haven't decided on a height yet, but your questioning about the height may have solved a major issue with the layout. Preliminary height in my mind was around 3ft; however, if I go 4ft, I get to ignore the racing sim since that is how tall the sim itself is... Interesting predicament I have run into now.
2. I have been considering trying to attempt magnetic uncoupling, but I think the best route for me is just manual.
3. I have a mix. Mostly sectional, with the help of flex track in a few spots where I need help connecting some track segments.
4. The S bends do scare me a bit, so I want to test them in practice before settling on them fully. In the past, I haven't had too many issues when running on my 22" radius EZ track with that spacing, but I am going to keep testing that out to get a derailment.
5. I believe I know the section that you are talking about, and I think with how I am going to operate it, it should work out, hopefully. I'll mock something up and test it. I only plan to use either my SP&S RS3 or my SP&S USRA Light Pacific in that section.
I really appreciate this feedback. It gets me thinking a bit more about what I need to work on to improve the layout. I feel like I am going in blind while working on this plan. Keep it coming!