I, and I think pretty well everyone lese, removed the plexiglass cover.
To get more than 6" travel - I repositioned the home switches to get the maximum travel possible. I also removed a (useless?) washer and screw on the right side of the table which stopped the X travel. I might have done a few other minor things too, and now my total travel on the 135 is 7.89 x 14.3
For parts bigger than the travel, get or make a toolplate with 1/8" precision-drilled tooling holes, for 1/8" tooling pins (I drilled mine directly into the milltable, although some make balk at this). Similarly drill "sets" of tooling holes in the bottom of your workpiece, such that you can "index" the workpiece.