I have determined a simple and easy way to hook up a timer, a solenoid valve for the propane, and a readily available ignitor (like ones used on gas stoves) to make this a fully automated device with a construction cost under $100 and safer to operate than a gas powered cloths drier.

This system would provide adaquate CO2 levels to a small to moderate area for months and months and when empty would only require a propane bottle switch out (much more common and much cheaper than CO2 bottle).

Is anyone interested in this information or am I wasting my time posting it?