How do I build the entire complex if the 4 tower types are unique building?

Thank you for pointing it out & providing the tutorial. Enjoy

Thanks for the quick update! Now it's all fine.

Check your folder AppData\Local\Colossal Order\Cities_Skylines\Addons\Assets for the pool and lobby. You used your local prop files for the asset. That's why Loading Screen Manager mentions them as private. Your asset does not include props: https://1drv.ms/u/s!Av6ccVLL7qtwlawzm3Z_Jk2K7Wo1KA?e=TeN8wi
You can check that yourself by removing your local props and subscribing to the building.
I've been using the rotors shader a thousand times for my own assets. It has nothing to do with this error message. If you want your asset to use props, you have to upload them, too so they get a SteamID. You can upload them separately - that's why you see e.g. so many air condition units on the workshop - or include them in your upload.
For this method you can follow Ronyx' video, with whom you are already familiar: Cities Skylines - Publish Building with Included Prop as a Single Workshop Item .

The Pool water & Lower lobby windows were props using Ronyx69's rotors shader script. Does your asset show the water or tinted windows?

I'm not sure which part of the building the lobby refers to. Do you mean the top or the bottom?
Oh and I forgot. I also get this error:
Workshop asset uses private asset (Selatapura Pool.New Asset_Data)

@Nickayz are the lobby windows still present on your asset?

This is very cool. But I get this error from Loading Screen Manger. Workshop asset uses private asset (Selatapura Lobby.Selatapura Lobby_Data)
Yes, I know the asset still works. Just wanted to point out 😉

Nice!

These are awesome! The illumination map could use a little work but everything else is really good