So my objective was to create a brooder that was tall enough to keep Squirt (my very curious cocker spaniel) out of, short enough so my daughters could see the chicks grow, and large enough for the chicks to have room to run.
Started out with a 4' long x 2' wide x 2' tall box with plywood ends.
Plywood bottom and back wall. Linoleum flooring for easy cleaning. I also put a $10 fluorescent light in. I separated the top section for the heating light.
Put some legs on it. The legs are attached to the top and bottom 2x4 framing.
Finished! The wire under the heat lamp bends up for access, and the right side lid comes off for access. Storage underneath.
(The curious cocker)