Your total room size is 120 sq. ft well that sounds big enough for 50 plants to me, even if you don't use the whole area. I've grown 25 plants in a 2m� (20 sq. ft) space with acceptable results, but I was using 7 litre (2 gallon?) pots and watering was very difficult as I couldn't access the back of the room. It was my first grow and I yielded 765g, I had 2x 600W lights. Since then I have always reduced the number of plants, now I never grow more than 18. I can get a higher yield with 12 plants as I could with 25, and it's still SOG style.
Here is the evidence, the room with 25 plants:


And here it is with 11:

So I hope these pics help you with your decision, you can clearly see that filling the floor space with pots is not necessary for a good SOG. With so many plants I guess you don't want them growing very tall so I don't see the need for 5 gallon pots, you're just making more work and cost unnecessarily.
I agree Super Mario this is exactly my experience too.
Can we see a picture of the grow space? Overall it sounds like a good plan but get a good ventilation system, heat will be your main enemy. Maybe better to try a grow with 50% of the space/lighting first?
Here is the evidence, the room with 25 plants:


And here it is with 11:

So I hope these pics help you with your decision, you can clearly see that filling the floor space with pots is not necessary for a good SOG. With so many plants I guess you don't want them growing very tall so I don't see the need for 5 gallon pots, you're just making more work and cost unnecessarily.
But mind you, I would never even attempt this, if I had commercial interests.
In my humble opinion SOG only pays off in Coco or using hydroponic systems.
On soil I would always go for bigger pots, less plants. One plant for every 1.5 square foot are usually nice.
I agree Super Mario this is exactly my experience too.
Can we see a picture of the grow space? Overall it sounds like a good plan but get a good ventilation system, heat will be your main enemy. Maybe better to try a grow with 50% of the space/lighting first?
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