I´m here again! (I was restoring arcade artworks for an operator than opened an arcade salon today and he absorved my all my free time)Hello there!
Sadly I don't have access to a hand scanner and I know that should be the ideal. For the circular decals, it has the same size of the saucer cap (which I have some spares here), so I've traced it in a paper, and scanned it as a tiff (600 dpi) image.
For some reason I can't attach .tiff files here, so I created a folder in my Google Drive and stored all images (and the scan) there, both images in HEIC and TIFF image formats are there, if you can take a look into it.
I've tried to measure all as best I can, and can (re)measure it if needed.
The link for Google Drive its this one.
Maybe this can be useful to @Andy B also (if his not got the decals elsewhere yet).