328783080 - Yeah? So what?

This mod tank is high pressure relative to the original, but it is low pressure relative to the current earth use.
The hydrogen used in the current rocket is liquid and has a density of 70 kilograms per cubic meter.
The internal volume of the 3x3x3 tank is approximately 250 cubic meters, which can be loaded with 17.5 tons of liquid hydrogen.
17.5 tons of liquid hydrogen is 196 million liters of gaseous hydrogen in the standard state.
In other words, the storage capacity of the original tank is only 2 % of that of the real world tank.
Your modified tank storage capacity is only 4 % of that of a real-world hydrogen tank.
The density of hydrogen stored in civilian hydrogen cylinders is also 13.5 kilograms per cubic meter, and the pressure inside is five times higher than that of this mod tank.