this allows for:
include <parameters.scad>
// override a variable such as
frame_z = 60;
include <components.scad>
which will let individual components tweak settings, e.g. the height of
a frame
nothing was materially using the non-snap-in cutout anymore (except for
the frame which wasn't updated since removing the bigger cutout
rectangle, so I fixed that), and I want to use it for a template thing
I'm working on, so remove some cruft
* frame width has been reduced in order to leave more space and have
sunken buttons somewhat accessible
* the cutout for neutrik mounts has been reduced and moved into the
holes themselves, to do this more modularly and restore some support
