I'm not sure what a coolcab style is, but i'm just gather materials for now, trying to figure out my optimal dimensions... probably between 2-3 feet wide, 4-6 feet high... 4-6 inch intake & prob a 5 inch exhaust or something like that, carbon scrubber - etc...

but thanks, I couldn't get the "skin" off, i tried with a toothpick, seems as if nothings there, will this be a problem? It looks like the leaves are starting to poke out the sides of that opening on the seedling though, but the tip of it is still closed where the brown spot is, which I'm guessing is the thing I need to get off in order for it to open fully... any other way to go about doing it, or should it do it automatically?