Again, A greattttt job. I remain inspired as I work on mine.
Three levels in my layout as well however I have taken a different approach. I gave up on a single panel and I divided the my control panel into several parts.
Two for Undertable Storage Yards - East and West, one for the Tabletop and Second Level on a single large panel, one for the Turntable Yard, and one for the Intermodal Yard. I used the Atlas 8.0 planning tool to print the layout in sections and then had a sign designer work on it and put it to a film and attach to a 'plexiglass' equivalent and I framed them in picture frames. There is no tape overlay. The largest panel is 20"x24" and the others are 14"x16" unframed.
My layout is broken down into blocks/districts and each one is wired for power and back to the panel as well with an bulb in the track plan to show that the particular section of track has power. This helps know that all the right throws and Cab1/2 buttons have been pushed and the train can go thru its routes.
There are approx 100 turnouts with control switches, though I do use some with the z-stuff DataDriver. There is space and some addition panels for the accessories and lighting controls which I have a lot of and also divided into groupings. EG, Oil Pump yard, Refinery, etc. I can turn the power on/off for effect and for saving of bulbs, troubleshooting.
There are a lot of building steps and some help from Dale H. on the use of a single common and Relays to keep the AWG of the wiring down has helped a lot.
While I am able to run trains, the panel control continues to be work in progress, 65% done. The yards and turntable area done mostly. The table top should be easier to do now that I have had some experience doing the wiring and have all the components on hand though the sidings and OTC controls seem daunting as implementation time approaches.
Good to see your fine work. Hopefully, mine will be to a point that pictures can be posted.
Ralph