It appears to be a desktop business.
Cut the mirrors, design the design, run the machine, profit.
Its portable.
They can be used to cut stencils for sandblasting glass, too.

I'm not sure that the 3d printer's work volume would allow fenders, might have to make them in pieces.

Both seem to be still in the developmental stages.
The engraver I'm looking at needs home modifications to perform better.