Disklavier

I have a Mark III and am very interested in the DKC 850.  I have spoken to several Yamaha dealers but still have additional questions that I'm hoping can be answered from people that have already upgraded to the DKc 850.

1)  Is the DKC 850 designed to be 'self installed' or is the installation required to be performed by a professional technician?  

2) If an option exists for installation then what would be your recommendation?

3) Where did you get the DKC 850 upgrade from?  Your local Yamaha store or somewhere else?  

4) I've asked about price several times and have gotten several different answers depending upon who I talk to and which dealer I speak with.  Does a "standard" list price exist for the DKC 850 upgrade?

5)  Are additional capabilities being planned for the DKC 850?