I took a look at the coop last night. The construction is not the same as in the link provided. The linked coop is walk-in. This coop is wiggle, squat in.
Getting the soffit boards off will take more work that it appears in the pictures.
The fascia board went over the soffit board then the drip edge over the fascia. It would take a fair bit to get the board off without making a mess.
When I get the roof on the back of my house I am going to pop a ridge vent in for her and help with the roost situation. I am also going to install a pitched frame over the tiny run area and install a polycarbonate roof with decent overhangs to give them a bit more space.
We'll talk about adding fold down aprons around the perimeter as it is a tractor and the thought was to move it around the yard every few weeks but with 6 RIRs in there, the grass would likely be decimated in less than a week.
The coop is much smaller in person than it appears to be in the pictures.