@ChicoryBlue has one I believe. Perhaps she can provide some guidance.
I like
@ManueB 's idea of a cage which you add privacy screens and a roof but lets you see them easily during the day. A Go would be fine for brooding if you remove the roost platform for them and fill the tray with chips or chopped hemp or straw. Or completely cover the roost platform. When I had chicks inside I put that up in their brooder pen as a high shelf to get on to, completely covered (the slats were covered) with that grippy, lacy rubber shelf liner taped to it.
My Omlet report - I have the Omlet Mk2 Cube, not the Go. I've liked how secure it is in case anyone gets through my predator fencing and netting & welded wire at night. It will withstand / hold off black bear, and large trees falling on it. It is very easy to clean. I don't know anything about the plastic's type, safety or environmental impact, sorry. It is double-walled, which is different from some other plastic coops, and that makes a difference for slowing heat changes and relative insulation.
The ventilation with the Cube is fine for five hens in winter in Upstate New York USA; air moves through as designed and I've never had any frostbite on feet or combs, and we have had both very wet and very cold winters. (The 3 Orpingtons have some comb, the 2 Buckeyes have pea combs.)
But for the very hot summer nights we've been getting this year I've made changes for more air exchange to more quickly cool off at night. Some people don't close the pop door, and even take the back off, but for predator reasons I want it closed up. I have shade cloths above the run and coop, set at different levels / angles to let heat rise up and out. I bought a second poop tray and cut out the middle and zip-tied hardware cloth on it. I put an 8" rechargeable fan on low under it, pointed up, and I've got two small 5" rechargeable fans clipped inside pointing out the vents. That has worked very, very well here with hot nights.
The roosting bars are not a problem for grown pullets and work very well with most poo falling down between the slats. There is a learning curve with them, but nobody has gotten injured that I can tell. I do like that the platform arrangement allows them to find lots ways to roost together - side by side or pointed different ways, and they can snuggle and face their friend and snooze together, or not.
One remote and rare danger with the Cube and the roost bars: the auto-door - which works horizontally - has caused two (separate) injuries reported of toes/one leg caught between the slot that the door moves into and the roosting bars platform edge when it opens. Both that I have heard of were with roosters, inexplicably. I and others solved that potential problem by placing a barrier, making a wall, in front of that area.
I will also mention that from what I've heard the new Cube "Smart" auto door (with wifi and an app) has glitchy problems reported and I don't recommend it. I would ask for the older style auto-door, with just the programmable timers & light-sensor. I use the timers and it has worked very well for me, I replace the batteries once a year. There is one other company that makes a compatible Cube auto-door, but note it does NOT fit the Eglu Go.
@Perris I tend to believe that lots of people sell their Cubes and Go's because they end up with more chickens than they're made to hold. The Cube holds 5 Standard chickens, 6 at most. Omlet now sells a big Cube "Pro" for 10 chickens to address this market I think. Some people remove the nest box divider in the Cube and put nestboxes elsewhere and that does make more room. Depending on the social dynamics and the climate, a whole lot of chickens can and will cram themselves into one Cube (12-14, with some bantams, but yikes!). People get two Cubes to accommodate that and the whole group still wants and needs to be all together at night, which makes sense to me. But it all depends on your chickens - I've seen online others that have several Cubes in a large enclosure with different "tribes" that work well. Each with a rooster and some hens, or a special pair of hens that want to roost away from everyone else, or little groups of bonded hens sleeping together.