Although I commend you for the ingenuity, personally all this seems like a lot of work. IMO it doesn't seem worth it when convection-style vaporizers are easily acquirable and all but flawless when it comes to vaporizing spice. Why complicate things?

EDIT: My intention is not to discourage you from pursuing this design. To me it just seems like the path of most resistance, towards a goal which is already easily attained.