That's by the amazing 6jirosdc. He's been working on this for over two years. When he first started, we was using a B&W screen, till I linked him to a color LCD. His programing skills are impossible.
For 1/48 or other scales, you can just rescale, and then test print. I dont own any 1/48 of anything, so I cant really test exact size, but it should be upscaled 150% +-5 to 10%