Thank you for the photos. I'm not the least bit concerned that you will have enough light in there. They don't need it bright at all, they just need to be able to see enough to eat and drink. One potential cause of pecking or cannibalism in a brooder is that it is too darn bright. Some people on the forum seem to think it needs to be blindingly bright, that's not been my experience.
With a month to go I'd build it to custom fit the area. The hardest part is the door. Screw a couple of 2x4's together and lay that on the floor in front to make a "sill" to tie to. Having a sill will raise the door up a bit above the bedding. Frame your brooder in and cover with hardware cloth or even chicken wire. You are inside so predator proof is not a criteria.
I suspect one problem is that you don't trust your building skills. A lot of people don't. There are a lot of u-tube videos and how-to articles out there that can help. Building a shed might be a good search for examples. It doesn't have to be pretty or strong, just enough to keep the chicks in and the adults out. Instead of fencing you could use netting.
Another problem might be that you don't have the tools you need. They can be expensive to buy and you may not know what exactly to get. I could build this with a saw and a screw driver, you probably could too but it can be intimidating. A stapler should be enough to put the netting or wire on. It's easy for me to see how to do this but probably not for you.
If you can find a pen that will fit under there, that can work too. You are in the coop. Predators and weather shouldn't be a problem. It doesn't take that much.
With a month to go I'd build it to custom fit the area. The hardest part is the door. Screw a couple of 2x4's together and lay that on the floor in front to make a "sill" to tie to. Having a sill will raise the door up a bit above the bedding. Frame your brooder in and cover with hardware cloth or even chicken wire. You are inside so predator proof is not a criteria.
I suspect one problem is that you don't trust your building skills. A lot of people don't. There are a lot of u-tube videos and how-to articles out there that can help. Building a shed might be a good search for examples. It doesn't have to be pretty or strong, just enough to keep the chicks in and the adults out. Instead of fencing you could use netting.
Another problem might be that you don't have the tools you need. They can be expensive to buy and you may not know what exactly to get. I could build this with a saw and a screw driver, you probably could too but it can be intimidating. A stapler should be enough to put the netting or wire on. It's easy for me to see how to do this but probably not for you.
If you can find a pen that will fit under there, that can work too. You are in the coop. Predators and weather shouldn't be a problem. It doesn't take that much.