Yes, I made that one and I have a smaller one for the arbor press.
I had the same problem using the stamps and this is what I've settled on for not only lining them up but also using the straight edge for a reference as well.
What I do is lay the letters out and get a measurement, subtract that from the over all distance between the borders, divide that by two and that's my starting point so I then put a pencil mark on the fence and place all the stamps along the fence starting at that mark and the distance at the other end should be the same as the starting mark on the fence.