This sounds like an interesting idea indeed. I would consider taking things somewhat slowly though.
Perhaps communication through email with some places that offer services like this will give you an idea about what kind of pitfalls can be expected and how to possibly avoid them (for example - insurance needs for the facility, potential financial "unforseens"... etc).
I would also suggest doing it in a time of the year that is colder. This allows many "closeted" gals to shave and not have to worry about others seeing them in shorts later. It would add to the whole experience.
I would also come up with some sort of privacy statement, including one signed by each member going to the getaway. The better you protect people's private lives, the more participation you will have - guaranteed. I would even consider outlawing any cameras unless they were supplied by the getaway, and all photos were approved by the individual members in them before release. I know it sounds corny and "stuffy", but it's just good business practice in this situation.
You will likely find that many people who want the most privacy will also be the same people that will be able to offer you the most monetary support.
Just a thought though... I may be wrong.