Good on you Oily,

Its good to see some one is giving it a go, you have done it very well but some cheap improvement could help;

• Look into a DC motor or low voltage motor mounted on removable frame as a drill bolted to the side is a bit unprofessional as to with the star pickets welded to the gas tanks.
• Check into insurance, dont want to scare you but what happens if someone's house burns down!!. Its just a thought as liability follows me around with every power point I install, car I drive and action made. Maybe someone could advise you on this, good advice is worth paying for, it saves litagation.

Good luck and keep going with it...