Square cube law says no it doesn't scale well I am afraid. The weight of the skin scales on surface area and the lift scales on volume of the displaced air. Yo

Square cube law says no it doesn't scale well I am afraid. The weight of the skin scales on surface area and the lift scales on volume of the displaced air. You can tweak for thicknesses and pressures some - but hydrogen is also corrosive in addition to being flammable and explosive.