No worries about access to the roosting bars, I had already made another 2x6 ramp and had cut steps for another but have decided I will add steps to a piece of plywood that goes from the nest box lip to the high roost bars. I now need to shift the other ramp but that'll take 5 minutes. Here's why.
Today I added the temporary brooder area, which is about half the floor. Plywood, chicken wire, a few hinges, a screw in eye, and a keychain clip
I added a hinged piece of plywood to the lip of the nest box extending to the poop tray on the right. I like it so much it will become permanent and I'll add steps to it.
Once that's open I can step over the chicken wire
But I also made it a gate because, why not
That should give the chicks a place to grow. The chickens a place to live. And they can both see each other and sort of interact with the chicken wire separating them.
Then I made two doors the exact same way. Started by cutting 10" wide by 12" tall holes. Welll, close enough to that based on my ability to cut holes in a standing wall

Then cut 2.5" wide strips of 3/4" plywood to make a holder for the door.
Then I added some 2.5" strips of 3/8" plywood to create a track and hold the door in place.
Added another strip of 3/8" plywood along the bottom so no critters can lift the closed door
I also got 1 piece of fascia up.

No pics though, it was getting dark. Whew. Just in time for some bad wind and weather, so now I can see if there are any final leaks. I seriously doubt there will even be a drop of wetnesss inside after everything I've done!!!
I think the inside is ready with <1 hour of work, adding steps to the plywood and changing the other ladder's direction. Then I neeed to finish the outside.