Center Vents part two

I got my Tom Doucet center vents together and they were a nice tight fit. I tried using the Tech-bond glue on them and only had one rib come loose the first time I placed them in. A little extra glue the second time and all was well. This weekend I will sand the Brown surround piece and put another coat of paint on it. I also need to find the best way of attaching the vents to my wood frame.

Here is a link to Tom's cheat sheet page on how to put them together.
http://waterset.us/WST-PRT-CVWL.html