I know that thread that you are talking about on IC Mag I filed it away just yesterday for a reference. Well, I would think about doing two wros of buckets, each row with 8 buckets side by side with 2 lights over each row. Also, 4 may be too many per light if you go with a bushier strain and let them veg for 4 or more weeks. I think that the Grape Fruit might be a good pick, but if you do go with them I would watch them around the 3rd week to see if you want to flip them early or not.
I think the room will be allright with the CO2 and current room temps, but just as a thought if you wanted you could miler the sillings, go without reflectors and hang the bulbs vertically. That is how allot of BC growers do it and with a few fans it can grow some jungles.
I don't know if you ever caught a thread on OG about a room that was about 13x15 with 9K vertical hanging lights and 12 buckets in a recerculating DWC/top Drip, it yielded 20LB per cycle and was in BC. Thinking about that, if you are only doing 16 plants you could do the DWC/Dripp. Maybe you are and I just didn't catch it. The benefits are double the O2 , more safe guards do to felling air pumps and the ability to switch to just top feed if the water temps get 2 warm, because you could just lower the water levels and use the top feed until you got the res temps under control even if it took a few days or more without losing a crop do to root rot.
Well, hope this helps a little
Adieu