The add of a plate was my first thought Robert, but since I do not want the bracket of the spindle to protrude from the side plates. Ideally I try to archive this: " Calculate or estimate where the center of gravity of the gantry will be located, including the spindle. Design your gantry side arms to compensate and place the center of gravity (CG) between the front and back X-axis linear bearings per arm. (CG should be located at ½ D4 and as close to X-axis lead screw as possible)" Photo is taken from this site: http://www.cncroutersource.com/do-it-yourself-CNC-router.html Very good info at this site, the guy has do a very good job! The good thing is that I haven't mount the side rails yet so I can adjust them, pull them more or less in frond of the bed. The way I am thinking to mount the wood for finger joints is with clamps vertical at the front of the bed.