I am trying to make a custom world in the sims 3 and need some help!

My vision for the world consists of many rabbit holes that have a very different vibe from the ones in the game. I know that there is a way to make my own meshes, but that seems way too complicated.

I also know that there are rabbithole rugs, to give lots the same functionality as a rabbithole. Using these, I can use the in-game building tools to build a shell. However, these shells are still fully enterable and it bothers me how you can automatically see into the "shell" and see that its empty with just a rug. I tried using the "Level Skip Marker" and "Hidden Room Marker" items in buildbuydebug but since these lots are zoned as commercial, the markers do not properly function.

Is there anyway to edit the Level Skip and Hidden Room Markers so that they also work on commercial lots?
Has this already been made by someone else? If I were to go in and make this change, how would I use S3PE to find these items and then edit them?

Thank you so much!

your rabbit hole rug won't be functioning if you place hidden room and/or level skip marker in the same room with the rug. maybe that's the way how the markers work, or you could just edit the scripts if you're a tech savvy.