so I am intending to build a 3x2 cage for my BP. I will probably use 5/8" plywood, but I may use 3/4". Just kinda depends but thats not really my issue.

My intention is to put vents on either end of the cage (opening at front, vents on sides). My plan is very basic but similar to Clay Davenport's 3x2, with a few of my own design changes. I was planning on using pegboard (like davenport's 4x2) but cannot decide on appropriate vent sizes.

Anybody have some insight on how to appropriately size my vents or is it simply trial and error? Cut a vent if its too small then make it bigger etc... That'd be a shame because I feel I can build a really nice cage if I can just get it all planned out ahead of time.