I leave that one to you. I don't recycle water using rockwool. I also don't use ebb and flow with rockwool. I do all top feed drain to waste.
You could do it with one res. The only problem is that you won't be able to use different nute solutions for the plant's different stages of growth in bloom (not a huge deal), and you'll have to flush by hand when the time comes. Although, flushing should be done via top feed.
It would be better for your small veg area to just have to provide half the plants at a time. I'm sure you could veg 100 plants in there. You'll just need to use alot of shelving. BTW, when I use T-5's I grow with a 2' x 4' tray under the same sized light. They say you can grow 4x4 under a 2x4 light, but that's bullshit. If you want tight node spacing and a good strong veg, all plants must be under the light...not off to the side. That being said, I think you can get between 20 and 25 plants under each 2x4 T-5...better figure 20. That means 5 T-5's for veging. Another single T-5 will take care of mothers. The mother light does not need to be as intense as the veg lighting...meaning you can light a 3x4 space with a 2x4 light.
I get 30 clones in each 10"x20" clone tray, and 2 trays under each cheap flouro grow light. So, you'll need 2 lights and 4 trays for clones. Those should be on top shelves for heat. Taking 120 cuts to end up with 96 is a good safety margin.
So, you can do 96 plants at a shot. Just don't get greedy with the veg space and crowd anything. Crowded plants in veg will give you low yield in bloom.
