Hi,
Just thought I'd point out a link to a website I found that is pretty helpful for owner builders. It's called BuildandSave.com and you can visit the site by clicking the link: http://www.buildandsave.com
They seems to focus mostly on prefab/panelized home systems, but there is a lot of info on the different trades and other resources. They have links to financing options as well.
Cheers!