I love the idea but the most importent thing to consider is an "out" stratagy.
For example, "shotgun buyout" - think of it more as a concept. A pre determined arrangement that would allow one of the members to purchase outright and the other shareholders would realize a higher gain than selling otherwise.
"You" want to buy "Us" out, it will cost you 10% over market value.
Also consider a sunset clause. A pre determined period of time in which the shareholders are commited to ownership and maintenance and can be addressed at a later date. Let's say 3 years for example. Appoint an independent party to collect in advance 3yrs worth of mortgage and predicted maintenance costs. As your 3rd year anniversary approaches, you get together at the campfire and discuss entering another term or opting out.
-Brian