yea. alot of plans I found on the net was still not economical enough. especially when it came to the using a Microswitch for a thermostat. That thing cost close to a low end factory incubator. So, a lamp dimmer is a good economical option.
Here is mines. Youll have to read further down to see my upgrades
http://www.thatquailplace.com/smf/index.php?topic=1643.0