As I understand it, we want a big exhaust fan. I use 400cfm in a bathroom. Pull that through a carbon filter. An intake fan is very inefficient, and can cause pressure pulse problems with the exhaust and end up with less ventilation.
It's just a nit, but, I've taken to putting the zippers on the side of an opening instead of the middle. And I put it in a extra big fold of plastic. And I wrap the zipper in the fold when I leave. Can't be too careful about light tight. I also use double panda and an offset zipper on the other side to form a light lock entrance. Double panda because I find that single sheet will allow a substantial glow. But, it's so diffuse it was hard to understand. That's where the light meter was handy. Also, I think the panda is less reflective and more diffusive (and easier to deal with) if it's hung in loose drapes. You can even ball it up a bit to get more facets of reflection to diffuse.
Looking good so far. Waste heat is your main concern. (mine is spilling water from the dwc and cooled light.)