HowTo: How to photo etch a PCB
Step 2 : PCB Design
This is my design I made it from http://www.cadsoft.de “eagle” with their free soft ware. You can make a board 4” by 3.2” with the free ware.
Here is a page http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm that has a trace width calculator to figure out what widths of trace to use for the amperage you want to put through them.