I have finally got the tops of the towers situated and figured out. One thought that I have struggled with is the weight I am adding to the gantry and the fact that i replaced the lower metal frame ends with printed plastic parts. I am or was afraid that the weight of the gantry might crush the plastic and change z height on 1 or both sides. Here is the lower bearing and mount I am talking about..



So I have the metal upper plates flipped upside down so the bearing goes in from the top and I have the collet on top of that so the top of the frame is what is supporting the weight of the gantry. In raw form here is what that looks like..