I haven't built my box yet. The area is 12' wide x 6' deep x 6.5' tall. I can frame whatever shape makes the most sense. I'd like to grow 4 big healthy plants at a time and if I decide I need more out comes the hammer and I re-frame it in a few hours. I was going with a square shape b/c I thought that was best practice with the HPS I was considering. Thoughts on layout much appreciated. Also appreciate the mentoring. I'll repay with documentation...