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They are going to outgrow that brooder extremely fast. You are also going to have chicks flying around the garage within a week if you don't put a screen over the top of that cabinet while you search for something bigger.
I recommend a trough style feeder kept up on two 2x8 boards stacked on top of each other to help minimize the amount of shavings they are gong to kick into the feed.
I also recommend fashioning a homemade "baby bottle" to keep their water clean for the same reason.
This cost me less than $10 to make and I still use it regularly with the adult flock for various reasons.
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