I have now had a a much better chance to explore the range of themes and the ZenPhoto info pages, too.
There is indeed a bit of genuine tinkering with the non-supported themes that is required. I do not know quite what I did and where I downloaded from, earlier. The on-board complement of themes does seem to be smaller than that documented, but what the heck! I also got a bit confused between [b]stopdesign[/b] and [b]stoppeddesign[/b].
There is always a bit of a learning curve in getting acquainted with new open source software. But yes this is well organised!
I had earlier installed zenpage, but I can get the documentation hacks that I need by hard coding the index.php for the theme.