@ ineverveg. IMO. Its impossible to offer you any meaningful advice as to how many plants can fit in a 1cubed area. ... You can think of them a bit like Lizards. They usually all start out small but some grow into Alligators and some grow into Geckos. ... To complicate further, there is much pheno variation in the same strains.
I grew some Geckos (Violator Kush) and 1 could get maybe 30 in a 1x1x1m.
Ive just finished growing an Alligator (Lemon Skunk) and its maybe 1 or 2 in the same size area.
SOG can take a little trial and error to learn the particulars of a given strain and how it grows in your setup. Your defo right in doing away with seeds.
They suck. lol.