Sounds as if you're raring to get building! I'm sure it will be a true work of art!
But have you thought about :
1. That baby chicks double in size each week?
2. They will get wings and want to use them by the end of week two?
3. They will want to have space to race back and forth, chasing each other?
4. They will produce an unbelievable amount of poo and dust?
5. You will need to clean and socialize (interact with them so they will trust you and be tame) the chicks several times a day, and it will be hard on your back if you're leaning over and into a box? And if you don't plan on accessing the chicks from the side, they will fear you more, and your back will want to divorce you?
6. The heat lamp will need to be continually raised as their heat requirement lessens?
7. A low "starter" perch to get them accustomed early on to roosting instead of getting addicted to sleeping in a pile on the floor?
8. Some windows to permit natural light to enter the brooder so they can become accustomed to natural sleep patterns after they no longer require the 24 hour heat lamp?
9. Some kind of netting over the top so they won't fly out and explore the big world too soon, as well a permit excess heat and moisture to escape?
I'm sure others can add more to this list. But you need to consider what the chicks' needs will be and draw up your brooder plans accordingly.
I began with a cardboard box on the floor, 2' x 5'. A few years later, I got smarter, and put two boxes together, side by side elevated on a table, with a pass-through cut into the adjoining walls. I covered the top with cheese cloth to coral the tykes. The heat lamp was just over one side, so they had lots of space to go cool off if they got too warm. I raised the lamp when they were spending more time in the other side instead of under the heat.
Water was in a hanging bottle, but you already have that solved. I elevated their feeder on some 2" x 4" blocks. They don't mind climbing up to eat, and it keeps the feeder above the wood shavings.
The most important thing you can do to rear great chicks is to love them and handle them a LOT!