I am just going to toss out a second option.
http://www.poultrysupply.com/reptile...Incubators.php
The juragon is quite nice add water set the temps and that is it. Yes it is 365$ but the herpstat is 110, and at least in my area a fridge coolant needs to be removed for disposal so that is another 100$ Then if you need to order flexwatt, connectors and wire it up yourself another 25$ so 235 out of 365 is your time and effort worth saving 130$ Just a thought, I am planning on breeding next year but will be buying a incubator it is simply easier and for me and the available time I have to spend on such a project not worth building something. Not everyone is in my shoes however that is something only you can answer.
http://www.poultrysupply.com/reptile...Incubators.php