Here's my Cube poop tray modification, I bought an extra one to try this, and I am going to do something similar with the Pro, I'll post that if you want. I zip-tied this through to the bottom side, but with the Pro I am going to try to do at least some of the ties just through the top layer of the tray. Also I don't think I need quite as many zip-ties to be secure. The ones here that didn't line up and nest in the grooves stuck out and made it a little tighter sliding in and out. I'll have to take a picture of the bottom to show you what I mean here.
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I will also be using vinyl-coated galvanized hardware cloth with the next version. Didn't have a problem with the regular HC, just think that will last longer with any exposure to poop. When it was really hot I didn't use the porch screen.
I set up little fans clipped to the nest divider and a bracket on the other side both going out the small back vents. Then I placed a larger rechargeable fan under the coop. It clipped onto a broom handle and hung there but swiveled up. I hung it all by resting one end of the broom handle in a hook which I attached to the coop frame, and the other end of the broom handle rested on a ladder step. This way I could easily take it all in for recharging without climbing under there.
(BTW an extra Pro poop tray costs $80.25, (with my 8% tax actually $86.67). I bought two. I also bought two extra roosting racks for $45.25 each, with tax $48.87 each. Shipping for these four items - from the UK, at least for now they don't stock them stateside - is crazy, it was $83.18 with tax. So in all it cost $354.26
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More than one person has made their own tray. Here's an image from the Omlet USA Facebook group, made out of aluminum angles & hardware cloth, this guy used a walk-in run panel as extra reinforcement/support under it too. This is secured with a lock on the frame which I like. Another guy made one out of wood and HC, very nice but he didn't secure it, it could just be pulled out.
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