Hey,
I have a 4x2x5 tent that could handle 2 large autos in 7 gallon pots. Usually the smaller the pot the smaller the plant. So if you did 8 1 gallon plants that might work...but it might still be tight.
@Experimentgreen,
Yeah I have two autos and I'm losing space quick I didn't think this out I had two going then tried to add six more seedlings ended up taking two out so right now I have the two auto about a month in and then 4 seedlings in the corner? Idk what I'm doing I just do what feels right kinda