Figure 3. Left: preview of rough tool path; right: preview of finishing tool path.
Figure 4. Left: zeroing xy axis; right: zeroing z axis.
Figure 5. From left to right: the block moved in the middle of milling (you can see the two holes on the edges); the feedrate was too high so wax melted onto the flute, resulting in rough finish; I used a flathead screw and heatgun to smooth the surface; after clean up.