The week my wife and I closed on our house, i installed my optishot sim in the garage.
I found a used marantz vp12s1 projector on craigs list for 300 bucks which has served me very well so far. Its not the prettiest thing, (it is a garage after all) but it serves its purpose.
I built my own impact screen with a king size white sheet backed with canvas and moving blankets. It stops everything i throw at it... I got incredibly lucky in terms of where i placed my projector.. I thought it would be a trial and error thing as far as putting it where the screen size was the largest, the open garage door didnt block the image at all, and being able to keystone the projector enough to have a good image. It went well, it was only one trial and no error. My head doesnt even cast a shadow when playing.
I've included some pics of how the screen was built as well as actual images of the system working both with the optishot software and a high def image. theres also a google sketchup drawing of the screen construction.
I've been having a blast with this sim, and my wife has finally warmed up to it.. :) If the weather is nice enough, its not uncommon for me to play 2-3 rounds after my daughter heads to bed. (doesnt hurt that theres a fridge in the garage usually well stocked with budwieser) nothing like playing golf at 11 pm with a beer at hand, listening to my favorite tunes on the stereo while its raining or snowing outside.
I'm more than happy to help if anyone needs advice setting up their room.. hope everyone is having as much fun with optishot as I am!!! happy golfing!