That folded leaf shape comes with some indica-strains and it doesn't mean anything.
On your box, I gave you rep for taking the plunge, and coming up with what looks like a pretty good design. If you permit me, a few suggestions:
-You might paint/disguise the outside of the box to look like one of those mini-cube refrigerators.
-On heating/ventilation, its not clear exactly what's surrounding your box there, but if your box is inside a closed cabinet, the cabinet itself will have to be vented. Otherwise you're just blowing hot CO2-depleted air around inside your box from the sealed cabinet.
-In terms of growing, you don't appear to have much vertical space there. What do you have, 24" or so total height? The most challenging aspect of your grow is going to be CONTROLLING THE VERTICAL HEIGHT OF YOUR PLANTS.
-Remember, you pots will take some up, and you have to keep the tops of your plants at least 2" from CFLs, or they can burn. So you're really looking at keeping normal-genetics plants from seed to harvest in maybe 18" of total vertical height.
That's doable, though I think you'll have a much better time of things considering steps from the outset to keep your plants small. Remember, plants typically double in height during flowering, and having constant control over the height of your plants is critical in small spaces like this. You CANNOT keep the plant "too low". Try:
a. Wide shallow final pots.
b. Train early. Once your plants have a few sets of leaves on them, bend over the mainstem so it goes horizontally a bit to save vertical space.
c. Strongly consider putting in a wire grid for a scrog to help limit height and train. Alternatively, you can simply tie down tops. Its even OK to tie them BELOW the level of the pot. The plants will always grow towards the light.
d. A space that size. . .I'd suggest one plant only. Obviously, you may need to grow more than one until you locate a female, but trying to grow more than one in there, with the two fighting for light and space may make things harder than you really want.