Are people interested in doing this? Like I would suggest a system.

Step 1: Person who needs maintenance posts problem, trouble shoots a bit (if you can't pinpoint problem, have people over)
Step 2: When you pinpoint problem, get all parts necessary, and post a date up.
Step 3: Have everybody interested PM you or contact or whatever to get address or somthing.
Step 4: Order pizza for everybody that's there that's helping.

This way, you have friends having free lunch, working on cars, hanging out with friends while helping each other out and eliminate some DSM stereotype by getting it done the right way the first time which in turn prevents it from breaking down the line.

-Aaron