Awesome build I am building something fairly similar, yours is much more refined though.
1510 Workbee Modified
Some of the things that I have done to my 1510 Workbee Installed Linear rails and bearing blocks with drawings. Installed Ops console Made conversion plates for extruded aluminum to casters Extended z axis travel by a couple inches with steel plates. As of now in the process of installing Lead screws across the 1500mm length.
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