I should remeasure my X3's Y travel - after my CNC mod I got MUCH more travel than stock - primarily moving forward since they didn't run the ACME lead screw back to the rear of the saddle, my conversion ran the ballscrew to the read of the saddle and allowed the back of the saddle to move flush with the back of the ballnut mounting block. Additionally I made the Y bearing mount extend from the face of the saddle so the back of the saddle could contact the face of the column. I want to say I got more than 7" travel but till sometime this weekend take this with a grain of salt
That said I would be interested in a beefier base if it handles the X3 saddle, there are some design flaws with the X3 base dovetails IMHO - so anyone who manages to find one do post where and how much There were no modifications to the base in my conversion so that would be an easy swap.
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