I'm trying to start my first grow and my research is quite complete I believe. I want to build a grow box for this space but it's a rather ridiculous space. I took measurements. Should I allow for a few inches when buying my PVC pipes to construct the frame? What complications could this present? I plan to vent it into the home using our natural vent system. How many plants could fit in here? Is flat mylar prone to cause light focusing? Going to bed, I'll check this thread over the course of...uh...later today. Thanks in advance.