My second router design

[Ross77]

Looks really good joe. X axis bearings are spot on. One at the back and one in line with the cutting tool.

Again probably a bit late but due to the unequal load capacity of the open bearings on the supported rail it is best to mount them back to back, so on top and underneath. This also pulls the Z axis closer to the gantry or gives you more room to widen the steel rails which will improve overall rigidity.

This would also mean you can move the lower blocks on the z axis down level with the under side of the gantry to make the most of them. wider spacing reduces transmitted load from the lever arm of the z axis.

This is only my point of view and others may disagree,

If you are planning to cut lots of ali it will be worth getting the gantry down as low as possible and then packing up the work piece to reduce z travel. (edit just looked again and realised you have.)

Happy building