I hope its not too late for suggestions but I'd recommend either the Area 14 idea or not basing the design around a specific site. Maybe just make up your own ideas for how the facilities halls and exterior looks. One last thing I'd recommend for a future SCP map is maybe switching versions to 1.16.5, in the discord for SCP Lockdown the developers have talked about updating to 1.16.5, and that version already has some really good SCP mods such as the updated SCP Overtime. it also has pretty good non SCP mods, such as create or others. I'll post my 1.16.5 map so you can use it to get a general idea for the version and maybe some inspiration.
