Congratulations on your retirement. You chose a fun 'project'. 33 birds will keep you very busy.
It sounds like a nice coop; I can't speak to the size vs. number of chickens, however, I don't see any ventilation up high and that seems to be important based on many other posts I've read here about coop design.
I've also read that the higher birds jump down, the more susceptible they are to bumblefoot - I don't know if that will be an issue or not, just wanted to share what I've read.
It looks like you're using straw / hay. I eliminated using hay due to the attractant of mites and lice. That could be an environmental issue as we are in the deep south with high humidity so I don't know if that is an issue for cold weather climates, I presume so.
Learning to chicken care is fun and this is a great place to learn. Have fun with your flock.
The shed actually has a peaked roof and there is ventilation in the eaves. I blocked most of the open lower cross beams with left over greenhouse panels because the stupid chicks kept wanting to roost on them and I was afraid they'd hurt themselves.
The bedding is actually over half pine bedding, with shredded cardboard, mulched leaves and a little straw mixed in. They just keep pulling straw out of the bale, so it is on top. Since I'm now using the dirty bedding for my compost pile, the cardboard, leaves and straw I used to use for compost is all going to the chickens to add nitrogen to.
I've been waiting for someone to address how high my roosts are because of the bumblefoot issue. It's the thing I'm most concerned about long term. I tried to mitigate the problem by giving them multiple paths to get down but still...some just like to jump/fly down. I see them make longer jumps/flights in the run all of the time getting from one roost to another. So I hoped it would be ok.
Originally, I blocked off the bunk and just had regular roosts on the back wall. But they were really determined to see what I was hiding behind the tarp, plus they kept going to the ceiling beams, so I opened it up and put roosts on it. They love it there! It's where everyone wants to be. Oddly, their favorite spot is on the front edge. I'm going to have to put another 2x4 on it so that it is 4" instead of 2" since they are determined to use it.
I was afraid to post the pics lest everyone say it is a really bad plan. All of my other options involve moderate reconstruction and limit the square footage they can actually use. It took me awhile, but I finally decided I'd rather know if it is bad than find out the hard way in the middle of winter.
The pics really don't do it justice. It's really cute when you step into it...and best of all, very easy to keep clean. I really like it, but of course I want what is best for the chickens.