There is an old thread that discusses the differences between the CSX 1000 series and the aluminum CSX 4000 series.
CSX1000 vs CSX4000
It is interesting that Ron noticed that the CSX 1000 trunk is more accurate than the Kirkham trunk. I think this all boils down to using the original trunk buck makes the CSX 1000 more valuable!
In case you missed the smileys above, I'm kidding!