The 17 sq ft includes the nests, which you don't want the chickens in. So actual floor space is about 9 sq ft. That may be an issue down the line, but let's look at ventilation first.We have this coop and then attached a large run to it and predator proofed/reinforced everything. So inside there is 17sqft and there are windows on either side but I still think it would be too hot to lock them in there for a few days to “home” it. The run we made and attached is 9’x13’, which we secured to the backside of this coop. We just took that door off the bottom so they can get in/out - up/down. I can still escort them to bed each night, no problem. And yes with these temperatures heat has been my main concern. I’m dying myself lol
Unfortunately prefabs are notorious for lacking in ventilation. I assume that's not an actual ridge vent on top. Are the monitor windows open? Hard to tell if the door is partially or completely open mesh for ventilation. Is there other ventilation open that's not shown? Is there ample shade over the coop and run area?
In a hot climate you'd be better off removing one wall entirely - like I'd give serious thought to completely taking off one bank of nests (you only need a single nest box for 4 hens) and then covering the remaining opening with hardware cloth, securely attached with fender washers and screws, or with trim wood screwed down. You can probably keep the existing "roof" of the nest box in place, to prop open like an awning for climate protection over the vent.
Also chicks do not instinctively use ramps. So you may need to teach them to use it, and will likely need to manually put them in until they do.