Deff agree. I have a veg room already.I dont think you would get seedlings to finish @ 12 - 15 inches without growing them sideways which would take up space
if you pheno hunt you really need two rooms one to veg clones/keepers one for flowering.
Grow the female plants to 4 nodes, pinch out the top and clone the top.
Flower the mother plants and keep the good ones you have in clone.
With two rooms you can start new seeds as soon as you start flowering stuff. The new seedlings would be ready to pinch out/take clones around the time you are harvesting the previous run.
Ad infinitum...
The irrigation system would be controlled automatically.50 plants per light and 6 lights are 300 plants to auto water. You would work your ass off just keeping the water lines proactive. Either way, keep us posted. For breeding, you can have more control with fewer plants to pollinate.