I thought this should be quite easy in Carbide Create Pro.
I’ve measured my stock and it’s roughly 31mm high, some places 32mm. I don’t care that it is not flat because it won’t make much difference to the egg holes.
First problem - I have to define a surface from which to subtract the holes. Now do I
a) set z to bottom and add the surface as 31
b) set z to bottom and add the surface as 32
c) set z to top and subtract the surface as 1 (you cannot make it 0 it isn’t allowed)
Second problem - what’s the Base - do I leave that at zero?