A faction base is indeed the best place to start a roleplay project, unless you can fight off or use diplomatic alliance with all major gangs and do your project in a TC town using militia.
So yes, i suggest an old bunker base, i can provide it to you. As for base rapers, you need to leave nothing of value inside the roleplay base, IT IS NOT TO BE A STORAGE BASE, use a tent near it. Also, only invite trusted players as members, others only as friends so they can be killed and wont see the base if they try to fuck up the project.