If you've a flat, square (to the board face) edge to rest the board on,
you don't need a fence at all. My old (really old) craftsman 16"
resaws just fine with a line drawn where I want to resaw-- I go pretty
slowly though. Just takes a good eye & a steady hand. BTW, I'm using
a 1/2" 4tpi blade. I would get straighter cuts with a 3/4" or 1"
blade its just that the one I have isn't worn out yet & my wife says
I'm just cheap-- I like to think of it as thrifty.
Phil