Hey man, awesome grow box, may have to give that a go myself!
On the topic of ventilation, have you checked the direction of your fans? As ideally you want the bottom front fan as the intake and the top back one as the exhaust, that way you draw cool air in over your plant and blow it out once heated by the lights. Also this way you get better airflow as heat rises.
As you're dealing with such a small space you might want to check LST out:
https://www.rollitup.org/indoor-growing/6834-how-lst-low-stress-training.html
Good job, +rep
Come to think of it, you don't really need to make it light proof, loads of PCs have lighting inside them, see what i mean!
lookn much better man, what is ur light schedule now ?
Hey TheBlisters
I'm doing a similar thing to you. 12/12 from seed in a pc case.
Did you ever check the temps with the lights out? I only ask because growth slowed on my plants when the temps dropped below about 55F.
LST is very useful for maximising your yields in such a small space.
Good luck with the grow.
yeah, now I'll water twice per week MAX.