I've been contemplating building a home brew. Don't think they are all that hard to do if you can get the cameras at a good price you can save a lot of money.
I repaired my Olympus digital camera myself and had to take it completely
apart to do so. I found pictured instructions on the net how to do the repair. Olympus wanted over $300.00 to do it. Cost me $35.00 for the part from Olympus and about 1hr. to do it.