This seems like a really cool concept! I've never done anything like it before, but I'm on board (no pun intended...) I'm curious, though, if you wanted to play a real person, is that just sort of a "first come first served" thing on registration day? Also, would you be required to adhere to that person's real actions that night?
If you play a historical person you will share the persons fate. John Jacob Astor will die while Madelaine will be saved in lifeboat 4. You can't change the fate of a survivor or victim.
You have to apply to Critical crew and passengers and the team will select who play them. They are Ismay, Andrews, Captain Smith, the officers and a few others.
Otherwise it is first come first served. I think it is a good idea to check on the Facebook account Titanic-Voyage (RPG) Fan Group
The most hardcore players make a passenger list before registration and it is considered bad style to take a passenger, some one else have written in the list because people sometimes use a year to prepare the voyage. You can send me private the person you will play so I can see if anyone I know of is also playing her/him. You can also ask in the group.
You can change a historical passengers actions in the game and their story so it better fit with you but not their fate. It was changed last year since someone had Benjamin Guggenheim surviving.
I played Ennis Hastings Watson from the guarantee group last year but this year I am actually playing five historicals.
You don't get the cabin belonging to your historical (only Ismay and Andrews). It is again first come first serve. Last year all the suites and special cabins on B and D deck were taken in 20 seconds. The rest of first class in 20 minutes and second class in an hour. Booking is March 10 at 12 am British time.
You can play severel people but need an e-mail for each one.
Don't be afraid to talk to others in the game. The community is really great.
You can also learn a lot by reading the Titanic Voyage wikipedia Titanic Voyage RPG Wiki
the FAQ is really good Frequently Asked Questions (FAQ)