Wow Lucky you !! sounds like for one you can sale your old projector to the brother in law and Hummmmm.
And have a upgrade party!!!!!!
You have a great chance to look outside of the box
Look at what others have done and make part of it yours or not.
Fabric for one like trapezia and rear projection may fit in to this back yard theater.
Need a concession stand or a place for audio visual eqiupment hummm.
You can say to the misses Dear looks like we are going to need a much larger shed or a hot tub room then thought.
And if you are realy brave you can say dear didn't you want a hobby room,get her on board.
Then if you and your misses are like me and mine you can have interesting time of it.
Try not to go to fast sit back drink a glass of tea...saver the moment.
Just think you have a chance of a life time.
I have a 12'x20' screen made frome trapezia fabric in my back yard and we think it has a outstanding picture.
Heck You may never know projector number Two may be in your future
Sounds like real fun...
Keep Us in the loop.