Projector add-on (build along one axis)
how about adding an option to the projector that makes it projecting one "layer" of blocks at a time?It already supports "show buildable", so it shouldn't be sorcery to filter/limit one coordinate.
Having the option to build a large ship or station that way would be a much more organic way to progress through the blueprint - and it would eliminate those moments where your welders can't reach a block behind literally one other block because of the rather limited welder range.
Oh and add a control pad to the projector block itself while you're at it? Please? ;)