You could fit 16, 5 gallon buckets in that tent. Each of those buckets could hold 3 plants if you dont mind a bit of crowding. Let those veg for 4 months and flower for another 2 1/2. You might get a couple of pounds if you FIM and do some bending.
My last outdoor grow was done using 3 gallon planters, and a couple 5 gallon buckets with at least 4 plants each in them. With a little lesss than 30 plants, I got 2.5 lbs. It was also a very shitty summer. Next year i expect the same yeild but with fewer plants.