i wouldn't go less than 2-3 gallon, because even 12/12 from germination will take 3 months or so.
more plants, more chance your plants don't finish on same schedule too, unless using clone of 1 plant. More work with more pots... more transplants more watering time, etc. not quite a 1:1 increase, but still more effort.
there's plenty of reason to do it too. you'll shave off vege time, which saves electricity, which is by far the single greatest cost to growing. less time growing = less risk in a general sense. probably never have to worry about supporting the plants, since they'll be smallish and hold their own weight.
if yo do a ton of plants, do 12/12 from planting. it'll vege for a couple weeks like an auto does, then start transitioning shortly after that. i don't know how much space you can expect.. maybe 1' x 1' per plant? then divy up space based on that. i would keep it symmetrical so that you don't have to spend much effort shaping plants. so 2x2 (4) or 3x3 (9) or 4x4 plants (16).
sf1000 is 100w? so maybe 4 small plants 12/12 from seed. looks like it should be fine for a 60x60 over 12hours.
whether it is worth it is personal preference.. you'll figure it out.