Check out this youtube video:
Looks like construction mode is mostly table top at different levels, with a very few grades between. So much for L girder construction!
Wish i’d thought of this; I have tried to jigsaw cut track boards to my plan, and fill in with scenery on cardboard webbing and plaster impregnated gauze. This looks like a whole lot easier; admittedly, it might have limited the track plan to something less realistic, but I could have easily made that trade.
Lionel Train Layout December 2023 - Bing video
Hope that link works. If not, search Youtube Lionel train layout December 2023.
Earkier stage