Uknot:
View attachment 1306620
The framed in opening of the door is 66" high and 34" wide. I made the jambs from 5/4" deck boards (which are a full 1" thick) so that reduces the width of the actual door to 64" tall and 32" wide. I then framed in door stops over the jambs so the door has something solid to close against. I do like the heavy sliding latch. It could be locked if one wanted to, but is way up off the ground and out of reach of any predators where it is. Left edge of the door buts up against the vertical framing used for the monitor.
Since I used T1-11 siding, door itself was made from the cutout of the siding, with wood framing installed on the interior to stiffen it up even more and to provide backing for hinges, latches, etc. A good alternative would be tongue and groove lumber (aka, car siding, drop siding, etc), but also with the proper support framing inside.
The opening I step over is about 6" or so above the skid framing....and about 12" above ground level, which leaves an abundance of room for deep litter over the dirt floor. Also elevates the bottom a bit to get it above eye level of most varmints that might be prowling around.
I wondered about the door 32" door width (same as many 2-8 doors used in home interiors.....closets, bedrooms and such), but feel it was best to do it that wide to make it easier to get new litter in and soiled litter out. I would not want it to be narrower.
Windows are 20" W x 25" high. These windows exactly:
https://www.lowes.com/pd/Project-So...25-in-x-25-25-in-Actual-20-in-x-25-in/3683850
I chose these as frames are vinyl and won't need to be painted. Glass has held up so far.......no glass has been broken to date. I worried the birds might fly into them, but none ever do.
Menards sells something similar (dimensions may vary). All sold and described as "barn sash", which are cheap, single pane glass windows. Perfect for this use.