that is exactly what I did...read, learn, get my ducks in a row...ordered 3-part, rockwool 1"x1", and hydroton.
built some bubblers and now....what a mess...

Here is the thing...If you are growing clones,vegging them 2weeks, then flower...You can put 4 in a tub.

but, if you veg them too big for yield, then they will just grow all into each other and waste all this energy, getting poor light penetration.

You are better growing 1/2 the amount of plants with more space. You can achieve the same yield with less plants if you grow them right.
tidbit of info: Did you know? clones take on the age of the mother. i.e. If you're mother is 4 months old when you take cuttings...by the time you root them they are 4.5 months old...Get it? So you can treat them as mature plants much faster than seedlings.

With seedlings however, you have to veg them longer to allow them to mature in order to take advantage of the most potent plant you can grow.
so, they get too big to be in a tub together...Plus, if the roots tangle and then one is a male; Now what? you have to chop it off and leave the whole root ball in your rez. and the stem poking up.

I am currently stuck with 2 clones that got vegged too long, but the roots were intertwined so they are all over each other. It's cool, but not efficient...know what I mean?

you seem to have the right ideas, so I will be around if you need some help.

lw

p.s. the 4 top you saw was early flowering clones that got transferred when before they got too big, and intertwined... I believe