I have a problem: the Z-tower is rotated about 0,68 deg arround the X axis. With a single point tool, I think there’s no problem, but I«m building a jig bellow the tower, with 500mm long.
With that inclination and length there’s a 6mm difference to the table between to two extremes of the jig.
That misalignment is constant when moving the 3 axis witch is not so bad.
You need to loosen up the center parts and watch things as you snug it up. You should be able to get it right. Make sure your z axis is tightened up, and parallel like the instructions say. Then try the center assembly.