Nice work, by the way. You obviously put some thought into the construction and design. Another thing to keep in mind is that with very limited vertical space, you will want to flower really, really early. Flowering at that size, your plants may triple in size AFTER you flip to 12/12. What do you have to work with, between the top of the pot and the lights? 15-18"? You may need to flower when the plant is only 5-6" tall.