I just posted the photos in my collection! I likely got them from Cloudster's website, now archived:
https://web.archive.org/web/2007020...m/Sets&Vehicles/STShuttlecraft/GalileoTop.htm
It does appear to be about the right size though and if the front panel was mislaid over the years (as shown by the lens cap photo) then it might suggest that the model wasn't very well looked after in the intervening years, hence the need for a more stylised repaint for its TNG appearance.
EDIT:
Here is a useful extract from that site:
The filming miniature is of wooden construction as is typical of models from that period. Unfortunately it suffered quite badly after the show was canceled as it was later discovered broken in half and sitting in a pile of debris at the studio. Fortunately for us it was members of the Star Trek Next Generation staff which rescued it and later restored it. It is in this restored condition that you see it above. Some parts are missing such as the front bulkhead (here replaced with smoked Plexiglas) and the corrugated wrappers around the rear of each engine pod. However, restoring it to its original configuration was never the intent, it was to appear as a model of a "standard type" Shuttlecraft seen in the background of one of the sets. The lens cap seen here being used as a make shift photographers scale is 2 3/8 inches in diameter.