I would try searching google, search downloads.com (yes lots of the stuff has spyware, so be careful) or ask some local drafters what programs (if any) they use.
That would be the program i would recommend . it's very verry good program for drafting. we use it at school. you have to pay for it though and last time i checked it wasn't too cheap.
2006 for single user cost like $690USD.
<edit> you can get a trial version for 30days if you want to try it out.
I knew about Auto CAD, but I thought that when he said a simple drafting program it gave me the idea that he didn't really have the money fro something like that.