It takes a lot of air movement to dry lumber. Kilns are insulated to hold the heat and humidity, while the air flow moves humid air out of the kiln, in a controlled manner.
Google Solar Kilns to get a good idea of how a simple kiln design works. They are slow but nearly fool proof.
Is your mill portable, so you could hook it on your truck, and drive to the local coffee shop-hang out, and park it out near the road
GOOD advertising. Just have plenty of cards on you at all times.
Good luck. Keep us informed.