It's not a perfect rectangle so I eventually just used some cardboard to make a template. You'll need to use something to prevent it from bowing. I used aluminum curtain rods since I happened to have them on hand. Click my sig pic to see my design.

 

>> BTW .... google is amazing

It is, but my original question was whether anyone has the measurements, and nowhere in any of these threads are there measurements. Hence why I asked.

 

Google didnt yield results for measurements ... but it gave ya something

GL