Now i do an own instructable about the screen of my homecinema.
Its pretty cheap and after the final cleaning it looks great.
Step 1: The blueprint and measurement
then i do a little sketch about how i would like to have the look of the thing done, and scratch the right measurement on the wall.
Step 2: Scratching off the wallpaper
We begann scratiching down the Wallpaper and under the wallpaper was older wallpaper and under this was more older wallpaper...
Step 3: Hack down the wall Plaster
Beware of your neighbours.
Step 4: Fill inn the screen surface
Step 5: Cleaning the Bricks
Its VERY Dusty, when you do this you should wear a mask.
Step 6: Cleaning Up
It was aufull.
Step 7: Sealing
This sealing is clear and also prevents the bricks from crumbling.