By the way, nice coop! It is so nice to see them before use.
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Mine are at waist heightI'm with aart, I put mine poop boards on the floor.
You can buy a plastic battery case for boats that would work the battery if you don't want to build a box around it. Do a google search for Marine Battery Box.
Not only will it prevent a chicken from electrocuting themselves, it will protect the battery from the dust and crap that the birds will stir up - coops are dusty.
Can you stand inside coop?
Sliding stuff along floor might be a PITA due to the floor bedding.
Might be better to build a shelf for trays under roosts...
....then get some trays close to size you need.
The autodoor and battery tray are both kind of in the way.
Do you plan to block off all the battery gear so the birds can't touch it?
My recommendation for a "poop board."
View attachment 1785174
Inside is smaller than I thought but, make one single tray. You are not going to be wanting to be handling individual trays full of poop and walking around inside trying to move them, pick them up. I used a single piece, cut to fit, of that white, fake board that they sell in Home Depot. It's a plastic of some type a half inch thick. I made a frame out of wood around the edge. It is One single tray and it slides out the back. Pull it, dump it, put it back and you're done. I fill the entire bottom of the coop with shavings. Chickens poop everywhere. Not just in a tray under the roost. You can see the tray in the bottom here. If yours has an access panel in the back, use it for this.YES! This is exactly what I'm thinking - just need to figure out to get one that's the right dimensions. Thanks!!
Just did a quick search - largest sheet pans are 26x18 - so probably two of them next to each other would be perfect!