This question may seem as it was asked before, but I think I just don't use the right terminology. Here's my problem. I'm an archaeology student trying to make an internal map of a prehistoric dwelling in which I use non-earth coordinates to show the localisation of artifacts inside the dwelling. I don't use any GPS coordinates, cause all the coordinates from my excel database are from an arbitrary x0-y0 which is a absolute point on the base drawing of the map (Is that what we call a non-earth system?).
So, I have no problem scanning the plan of the dwelling, making a png with it and using it as a raster. I put my coordinates points (8 of them) on the raster layer with the georeferencing plugin and it work. But, the problem is that I want to add vector layers of, for example, the turf ridge of the dwelling, or the rock pavement, or the different fire-pits. These vector layers are DXF that I draw on Illustrator. I'm able to send those on my qgis project, but they don't have embedded coordinate points so they appear on my base map at a totally wrong scale. My initial plan was to georeference these as you do with a raster in qgis, but I don't see how. Is there a way to resize and manually adjust those over my raster to correct the scale? My plan is to be able to work with the vector/shapefile layers and keep the scan raster invisible.