My 2013 seed starting hotbed.

I don't like starting seeds indoors, it takes up to much space, all the lighting etc., problems with damping off, and memory's of children filling cribs with plants and dirt during nap time. So I am working on this years hotbed, in a different location and dimensions that last. I made mine 4 feet deep last year which is too deep to reach in safely. So this year it will be 36 inches deep. Also I bought some old screens today for $15 that I will cover with two layers of plastic. Last year I used glass windows. Some broke, and I thought they were dangerous. I only dug 2 feet deep last year, and I have gone 30 inches this year. The length is 12 feet. I plan on using a squirrel cage fan for ventilation, and perhaps a small auxiliary heater connected to a thermostat. I found on the "net" a rather simple design for the frame.