Like Stefan, I also have setup which is not based on B&O's suggested products. The Stewart Screens are without any doubt the best on the market, but very very expensive. I have a motorized mult masking screen (Davision) and  a JVC HD1 projector. Both are controlled by the Lintronic box, the screen via IR and the projector via RS232. Works without any problem.

In the future I will integrate light control with the JB Media Interface which is now available as a pro version to set light levels by percentage with an RF light control system like the F20.

http://cms.jbmedia.de/index.php?option=com_content&task=view&id=84&Itemid=1&lang=en

This is the budget way to go, may be not that relaible as the EIB/KNX or full Crestron integration but for a fraction of the cost. 

Karsten