I hate it. How could you build something so great and not offer to build me one? How rude! You and your fancy brooder and me stuck with a Sterilite box! SHAME SHAME SHAME (I love it)
EDIT: There's something missing. It's the equivilent to our heroin.... CHICKS!
Omran, great job, as usual. Is that a shelf I see in there with space for the chicks to hide under? Is it adjustable? Depending on the number of chicks you plan on housing in there you might want to put a removable divider in it with a door for them to go from one side to the other. That way if they get too hot they can go to the side away from the heat.
What kind of perches are you going to use for them once they start to get bigger?
I wouldn't put boxes in there for them to play on or in. Might cause problems later on when the pullets start to lay and everybody wants to play in the nest boxes.