I`m using the -238 box. See: http://www.lintronic.dk/TT455-RT-238.htm
You do not need a specific screen. any motor screen will do. You can control it via IR (if possible) or X10 or relays....
Here is a list of devices you can control with the lintronic box.http://www.lintronic.dk/asp/LinTronic_SupportedDevices.asp
For home cinema control just connect the 2 outputs of the BV7 (9pin) to the digital inputs of the Lintronic box (see pinout: http://www.lintronic.dk/TableTopVersion-Technical-005.pdf), and let the digital inputs control all devices/functions.
Digital inputs are pin 1 and 4, ground 5 (Lintonic box).
Create a macro in Lintronic`s memory map: when receiving digital input 1 on, send projector on, screen down, light off...
2nd macro: when receiving digital input off, send projector off, screen up, light on....
"digital input on" and "...off" are sent from BV7 by pressing FORMAT 0. It`s a toggle command (right word?).
You will need a special cable for connecting BV7`s HCC output to Lintronic`s digital input. Both are 9 pin but I think the pin-out won`t match.
Stefan