the design of the volcano is simple. a ceramic element heats up, a fan blows air past the element, then the valve system is the though part, but you could just make it a whip at first. Then the control mechanism is a potentiometer attached to the power for the element. and thats basically it. think a hot glue gun, with a fan and a screen/storage for the greenery. very basic. the toughest part will be getting the correct settings and parts to make the heat stay even.