We are up to Version 3.0
Has some problems… the right frame side was slightly bowed :-(
To discover that I had to lay the complete chicken door on a level surface and then gently press down on all four corners and yes… one was sitting up a bit!

Went through my 40 x 20mm pine and picked the best one which I cut in half the ran them through the table saw to cut the channels.
Version 3.0 is working well and I’ll check operation during weather changes – mainly humidity.