Bungie mounting a finished screen, how much bigger to build frame?

[bm11]

Asking the question because I'm going as big as I can on the screen and don't want to order a screen only to find that I don't have enough room left over to hang it correctly. How much bigger should the frame be?

Thanks,

Bob

[BGCurtis2nd]

Here is how I did mine, I used the tarp clips and built a shelf one foot out from the wall for the top to attach to, and then gave my self six inches on each side and used eye-hooks in the wall to attach bungee.