In the viewer I was able to add a new BMP into a tester SHP file I have in the folder with the viewer.
I was able to adjust the X/Y coordinates to center where I wanted the tester hull in the file
But
When I viewed the full file the number of that Hull was gone as was the crosshair I had centered inside the turret ring
I can see the result of the changed header but I could not find a way to save the file with the new hull
Is that what you see or did I miss something?
As you say not 100% yet but it is very interesting