My reaction to your thread is as follows:
1) It is quite a system you plan to control and if it is new contruction why Radio RA?
2)I think it sounds like you are trying to assemble what you are able to get here and there. Maybe that is why most dealers see red flags!
Generally we will never sell a Crestron over the counter and if you were able, I doubt you could get all that stuff to work seemlessly. No offence !

As per the pre-wire, I would approach it as a"you are responsible" for any or all problems related to the trim out process . As for the Crestron, we would supply you with a turn key job and price with all software developments done in "our" house.

Hope this helps,

Twix.