#2: Slider for: 1x1x1, 2x2x2, 4x4x4, ... (1,2,4,8,16,32,64,...)
Why? because then it is independent on which scale you build, it always has the same relative resolution.
It should also be possible to build/remove aligned to an offset + grid-size (currently fixed to the values {0, 1}).
More than...