What I do have in mind more and more, is to use the 'column' layout that Dr Byte updated recently, convert moku's book product or the music one, to make the product listing look like a gallery. The categories would become the galleries and subgalleries.
(so far I have moku's books add-on showing in grid form, the book pics would pass for a gallery, and its dead easy to turn off the right hand column just for the pseudo-gallery :)
This would be a much more easy process (I know!) than integrating 'foreign' galleries by 'include' - galleries which can change their version code, at the same time with zencart also changing rapidly, its a minefield to update.
So... all I need is the product list column display, and some extra css to make it look gallery-ish, and removal of most of the associated product text, so one just sees pictures
--and need to make that new 'gallery' product type for zc.