I replaced the 2500mW laser with a 7000mW laser for faster engraving/cutting speed.
And I also added aluminum plates to the sides, the bottom and the back and added a fan for the exhaust to the backplate.
The machine is now ready for engraving (and cutting of thin material).
The galvo assembly could also be used for 3D printing in a SLS or SLA 3D printer.
Maybe I should do this next...