Jim, I think the problem with the image pages is that they are on the non-permalink urls.
If I recall correctly, the template was designed, and set up, to take the viewer to what you call the metadata page where there was no image link, and people had been using a search results link - which was session set and thus timed out causing url not found errors.
As a fallback, if we use the template for even those results where there are image links, at least they can click to the images from there.
This is a problem generated from the NAA end that, apparently, they have no wish to correct. Maybe it's a funding issue, as with Trove. Maybe we need another petition. (I agree with the suggestion that they contract out to Libraries Tasmania!)