This is a unit that is 69" tall......the actual brooder unit is a 4x4 square that is 2 feet deep, divided into two brooders that are 2 feet tall, 2 feet deep and 4 feet wide. The height may seem strange but it is very specific.......it is tall enough to slide those $4 plastic totes you can buy at Walmart and other places.... Here is an example. First off, I used 8 foot long 2"x2"s. This requires 9 of them, which is exactly 1 bundle It also requires 2 sheets of plywood. I use the thin stuff......1/4" I think? I let Home Depot cut it in half for me, which makes two 4x4 squares. If you want, you can also have them do additional cuts (might cost extra). For this project you need 1 piece of 4'x4' plywood and 5 pieces of 2'x4' plywood, plus 2 pieces of 1'x4' plywood. You also need approximately 4 feet of 24" hardware cloth (1/2" mesh) and 2 x 8' pieces of 1x3' for doors. 4 hinges (3" hinges used, $2 per pack of 2 at walmart) 2 safety latches ($1 for pack of 2 at Walmart) To make one identical to mine, you need to cut the 2"x2" as follows: 4 pieces @ 69" long 6 pieces @ 45" long 9 pieces @ 21" long First, get your junk all out and ready to go. Look at your other projects in progress and sigh. Then move on. Cut all of your wood in advance. This makes everything so much quicker. I like to clamp the same length boards together so I know they are exactly the same size.....clamp together and then just make 1 long cut across them all intead of 4 individual cuts. Oh look, all done cutting and ready to assemble. First, lay out 2 of the 69" long pieces. These are the legs. Lay out 3 of the 45" long pieces, one at the top, one at 24" and one at 48". Screw them all together. I use 2.5" exterior screws for all 2"x2" to 2"x2" joints. Once you have one panel screwed together, lay the pieces for an identical panel directly on top and screw that panel together. This ensures each panel is identical so your levels will be pretty flat. Now you have two. The front and the back. Then take 6 of the 21" pieces and screw them as shown below. Then flip that over so the short little 21" 'legs' stick straight up. Lay the other panel on top of this. And then screw it down. Your frame is now complete. Stand it up and admire. It will be wobbly....don't worry, once all the plywood is on it strengthens it. While you're admiring, decide which side is prettier.......that will be the front of your brooder. Then lay it back down...pretty front side DOWN. Take the 4'x4' piece of plywood and lay it on top. This will be the back of the brooder. Clamps are helpful to hold it in place. Screw it down. Then turn the unit onto its side. Place a 2'x4' piece of plywood on top, clamp into place. Then screw it down. Then flip the unit to the opposite side. and do the same. Go ahead and stand your unit up. Admire your hard work. Now you just need to put the floors in. Take two of the remaining 3 pieces of 2'x4' plywood and cut a 1.5"x1.5" notch into each corner. This is to allow the plywood to fit around the 2"x2" LEG at each corner. Once the shelves are notched, slide them in and screw them down. Then take the remaining single piece of 2x4 plywood, put it on top, clamp into place and then screw down. I cut two pieces of plywood that are 12" wide and 48" long. I put one on the front left and one on the front right. Clamp on and screw down. Then I made the doors using 1x3 wood, 1/2" hardware cloth, scrap pieces of plywood and 3" hinges. I used the little "safety" hooks as latches. ETA: I had 3 extra 21" pieces here because i forgot to put the "crossbrace" in the middle of each level. This can be added at any time. I will add it later if needed. Also, I use 1.25" or 1 5/8" screws to screw the plywood down to the 2"x2"s.