Based on my numbers. My girls drink 0.4-0.5 liter/hour at their peak. The RO replenish is crazy! See my other post for calculation. You can find dehu capacity for a/c. But going with led, you'll need to keep your temp higher so less AC time so more dehu needed..
As for the space, you can add moving table if you want and be able to give a 2' each side when you work, but you have to think you need space to work. Rdwc system in mind, not soil, too messy, not productive. With that budget in mind, I'll be going rdwc and not loosing time with soil/coco.