Hello! I am planning on building a couple new brooders as I have three batches of chicks arriving this spring. I am planning on building area brooders with hover heaters (Ohio brooders). The plans I see online and in Plamondons book are 4x4, and I was wondering how people feel about the efficiency and cost effectiveness of a smaller unit (like 2x3). A 4x4 unit is the most effective use of a sheet of plywood and a smaller unit will still use one piece (you cannot make two 2x3 units with one piece of plywood) you can however make two 2x2 heaters with one piece. I usually brood 10-25 chick batches at a time. Any thoughts?