If you're growing from seeds, I wouldn't transplant until the preflowers show you which are females. Unless you're purposely growing a seed crop, of course. You can veg five plants in a C13.

Looks like you're set, really: decent light, perfect size for that cabinet, good soil, good nutes. Looks like you've done your homework, which was smart, and which many don't do.

Let us see some pics once you're going good.