Hi okapi, how about something like this:



That will let you pick 4 points to do image registration - you pick a base point and reference point on the image (you'll probably want to zoom in there, I didn't do that to keep this screen capture small), then pick a target base point and target reference point snapped on to your geometry.

It will then do a combination of move, rotate, and scale to make the image aligned and sized to the right amount to align with that geometry.

- Michael