Ehhh...sliding trays seem like a great idea, but don't really work well.
Make sure you have access to easily reach every corner of the coop...
...and to the roosts to remove birds at night for exams.
Go taller if you can, the higher the vents the better.
....and leave the nests exterior for more floor space.
Here's some info on heights:
https://www.backyardchickens.com/articles/coop-stack-up-how-high-stuff-works-well.73427/
Oh, and....Welcome to BYC! @J garden chicks
Where in this world...