I put the link in the discription, but here it is again
http://homokaasu.org/rasterbator/
I didn't take any measurements for that either, I just blew it up, printed it out, and realized, where the heck am I going to put this?
But I put it together and it fit nicely right there.
About 1/2 a roll of packing tape on the back of it to give it some strength so it doesn't fall apart under its own weight. Its held up by 5 tabs on the top, I took some tape, folded it over 5x, and had about 2 foot stick to the back of the poster. I put the pins in the tabs. There is also 2 tabs on the bottom to hold it down when I have my fan on or the window open.