Things to consider:
Where do you put your gear, auger, tackle, heater etc. No room for gear in tub.
At 26 sq ft fishing area 50% of the area is consumed with chairs, heater, tackle, bait. That leaves about 13 sq. Ft. for holes.
Ranger weight is around 1,400#. Add a few 100# for gear and another 400 for 2 guys, you need 8" ice for safe travel. Kinda kills early ice fishing on 4" to 8" of ice.