Ooooo--that's pretty!! I tack a big ole piece of white felt on a wall and it works perfectly.
Lately I've been laying things on the piano room floor (dining room?) and then I take a picture of it with my digital camera, then print it off and tape it right by my sewing machine. But that's for less complicated things than you're doing.
You still might want to take a picture of it when you're done--before you sew.
For sure we'll see it done soon--yes? :D