Hey BarO...
I think the photo with the eggs was taken of a unit with a removeable top. It appears to be a design with no access from the 4 sides.
The correct WD opening is 3" tall x 4" wide. I cut mine with two 3" dia holes, staggered off center horizontally by 1 inch. I find later that the ideal hole is more "football" shaped. I have seen both types, but the football seems more prevalent. I asked Myron if I had made a fatal mistake and he replied "absolutely not...go with it".
I have a set of drawings for numerous different types of critter nesting boxes. One page has the various hole sizes/shapes. The raccoon hole is 5" hi x 6" wide (for the record, it is the same hole for a Common Merganser). I don't know enough about raccoons to be able to say if they could squeeze thru a 3" x 4" hole....or how far they could reach in...?
