@ 1 oz of lift per Cubic foot of helium(not counting weight of containment) this will get huge just to help carry a fraction of the weight. Doable and good idea, but gonna get real big to make any difference. Bigger=more drag = more power to move = heavier=more power=heavier.......
80 cubic feet to carry 5 lbs, not counting weight of containment. Now you gonna build a blimp or an airplane? Both may work.

Brooks