This is something I would love to build, not sure if I have the skills though.
Workbee CNC on steroids
Build in 'Other Style CNC Mills' published by Vunnie, Nov 23, 2019.
My First major improvement was changing the controller to a Acorn board. I loved the way a dedicated userinterface was speeding up my workflow. Next project my Y Axis. On Aliexpress I ordered a couple of 16mm ballscrews and some lineair rail. Before I took my gantry off I quickly made some aluminium profiles to fit my carriages. Withouth any doubt these improvements where worth it