I've gotten some measurement guesses from you n hopefully accurate rulings in metric from Dawn ( I did my best to go online n convert as I don't work in metric at all )... This is a "proto" made of white oak for strength as the over 1" width entrance at 3/8 ( 7 to 8 mm ) in softer woods would be probably to fragile/weak to jerk in n out.
I cut the length about 1 mm long to make up for variations off slight different of hive width. Also I made slightly taller so I can add a slight front to rear bevel angle if needed.
. This isn't any Boeing 767 aircraft either so close as i can without having an actual full Flow-hive here.
. What do you think ? Should I make several more so I have a model n send one down to you ? Just send me a personal what you want to do or not do !