Blocks that will be valid for construction will be highlighted. When starting a ship from scratch, make sure to align the hologram to the projector and start adding blocks that are next to the projector (or to blocks connected to the projector). Small projector block can project only small ship blueprints)
grid size of the blueprint must match the grid size of the projector (you can project large ship and station blueprints only from the large projector block.
