[Skidz]

Neat-o BB. What if you put the door at the front? (Reverse the box). Helis are frequently nose down when flying so might be easier to drop the payload. You could then do a high speed jelly bean dusting on spectators.

I noticed in your video that you had to pull the nose up to get the box at the right attitude so the nose down might give a better result without too much conversion work. Failing that, I am sure you will come up with the necessary solution.

Footnote: I watched the whole video