I built one this past spring (actually my son-in-law and I each made one together) and they work pretty well. We used the plans and ideas thanks to the guys here at this web site:
http://www.jesseshuntingpage.com/homebrew-cams.html
Its not to difficult to build one other then a little careful soldering and a little thought process in making a box to put it in. They can be built for less then $100.
I have a few of the pics I have gotten here:
http://community.webshots.com/user/trkeyhunta
Edited by - RayC on 09/09/2002 08:27:59