dont use anything black it eats up light and causes heat no curtain! and dont use foil just paint the wall flat white it will work alot better. and why do you have 2 18 watts + 13 watts in veg and only 2 18 watts in flowering chamber the flowering chamber is going to need more light than veg. also remember to buy the right kind of flours if your going to have to different chambers. cool blue 4 veg, warm or full spectrum for flower. you could consider running a light down the side of the flower chamber for added grow and density. is this going to be in a cabinet or r u going to build this or do you already have something. dont forget intake hole and outake for fresh air. well your idea is good just needs some tweaking, good luck!