Thank you. I just added some more photos to the article
Inside height above ramps is about 11" right now. I Tested it a few minutes ago with a few boiled eggs, was I ever glad they were hard boiled! Too fast at 2", so when I get back to this I'll try 1 3/4+ -.
For trap nesting I think MANOZ had less than 6", (don't have those notes handy right now) entry height, and I don't want them standing up (and pooping on eggs) so it is a little lower inside the nesting area than some designs.
I Don't have a test chicken anymore