Bought a “small” coop

[aart]

That huge gap is why I want to get rid of the sliding floor all together. It would be too much trying to make a cover for that and a big door on that wall I’d think ?

Lots of ways to do it, easiest would be to just leave the slider floor in there and make the doors above it(as I showed).
Or you could add a permanent floor and make the doors come lower,
leave some depth there so bedding doesn't fall out when you open the door(s).