This is what I think:
What you have right now is a “proof-of-concept” map. It shows that your map works from a technical point of view but it doesn’t show itself as aesthetically pleasing or present an intriguing storyline/motive. This is absolutely okay. You’ve seen the idea works and you got people backing you up. So what now?
I’ll be blunt and say you will have to start your map from scratch. This is the time to lay ideas down and plan the whole thing out: what’s the main objective? What are the key parts of the map going to be (what are the plot-important rooms to visit)? Why is the player there to begin with? These are just a few of the questions you should ask yourself.
Lay out how the hall will look like. The hall is the main area and it has to look amazing. Look for pictures of fancy hotel halls on google and what not. Do hammer studies: try to replicate some hotel halls from pictures before you take on the actual project. Figure out how you’ll do the lighting too. After you’ve done a couple studies you can apply all that you’ve learned to your actual project.
You have a good idea but now you gotta lay out everything on the table and get shit organized and sorted out. This is the main problem with beginners: they’ve got very ambitious ideas but they can’t execute them properly because they didn’t spend the time doing the boring (but VERY important) shit (research, layout, planning, studies) before they took on the actual project.
If you keep working on this with your actual plan I’m almost sure the result is gonna be somewhat mediocre, especially compared to what you would achieve if you do all that I recommended you.
If you need help with this project, add me on Steam. I’m an experienced mapper who’ll be glad to help you take on this project. Look for #MenteR.