A CNC shaker front is not an assembled frame: it is a solid panel with a flat-bottomed pocket milled into it, leaving a 60 mm frame proud and the field 6 mm back. A straight cutter does that job; a true five-piece frame needs profile tooling on a spindle moulder.
On its own this cabinet uses only 14 % of the 3 sheets it consumes. That is normal, and it is why the app nests the whole job in one go: one carcass's offcuts take the small parts of the others.
19 mm MDF is the material for this front: homogeneous through its thickness, it shows neither ply lines nor grain at the bottom of the pocket, and it takes paint without any figure telegraphing through. Plywood would leave the field striped with plies.
The 6 mm depth leaves 13 mm of material under the pocket. That is enough for the front not to cup, and little enough for the frame to read clearly in raking light.
The shaker pocket is machined on the front face, the Ø35 hinge cups on the back. The same panel therefore passes under the spindle twice, flipped in between.
Cabinet·CNC emits one program per face rather than one file. Face B is mirrored about the sheet width, and the file header announces the flip. A single file that assumes the flip has happened drills the cups straight through the front.
Between 50 and 70 mm. 60 mm is the usual figure: below 50 mm the front starts to look like grooved ply, above 70 mm the field gets too small on a narrow door. The generator takes any value and checks that a field remains.
No, and that is deliberate. An assembled frame-and-panel door needs a matched groove and cope profile, so shaped tooling on a spindle moulder or a router table. Cabinet·CNC only produces what a straight cutter can do on a 3-axis CNC.
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