I have a request for a job, not sure yet how to cut it, pretty certain my machine is up to the task, be good if it is :)

Material - 6mm brass or copper plate.
Depth to machine - 1.5 to 2mm

The job requires milling away probably 95% of the surface to leave a raised line or design 1mm wide at the top and with trapezoidal sides, about 2mm wide at the base.

The corners to be sharp as possible, edges to be smooth (no burrs)

Sounds easy and i know what they are for as i use them in the day job - printing blocks for hot-foil stamping machines.

Questions...

Milling away the waste sounds easy - biggest tool and have at it, leave allowance of course.
Cutting the trapezoid shape - not sure what tool here - engraving tool??
Any suggestions appreciated.

They can also be made in softer magnesium plate but there are serious fire risks involved in working with that stuff so I don't think i'll go that way. Aluminium is too soft generally but might be worth a test.

Exciting stuff ;)