each overhead fixture can cover a 3' x 4' area. This will leave room for aisles. In each of these two spots you can place (12) 5 gallon pails, maximum. That's (24) total pails.
SOG would be gone with smaller vessels like one or two gallon brow bags or buckets, lots more plants stuffed into the area. SCROG is a good management system but it does nail the plants in place. I would suggest trying SCROG at a later grow when you have some of the initial FAQs answered.