Good choice on the D-ILA and especially on the Phelps calibration.
Look for a true custom pro who is also comfortable with millwork and trim carpentry because you will want that projector enclosed and ventilated. They are LOUD!! and IMHO, it is a detail that makes more difference in the final audio performance than cables or power conditioning ever could.
That said, get good cables and a power conditioner, too.

Since you bought your gear elsewhere, pe prepared to get high bids from any reputable installers. I know we don't discount AT ALL on jobs where we are not using the products we use all the time and made a little bit of money on to boot.