red is cut

blue is engrav

i saved the design twice because one version is mirrored

i have set a kerf of -0.15 for the cut-outs on the base plate
you can adjust that 

i have engraved the back again 
I used the camera from the M1 and framing it several times

but i skipped the cutting because it is not necessary anymore and rather bad if it is not quite 1to1 on top of each other

plug together 
it is very strict 
but be careful not to break anything