Started late on this. I wasn’t as thrilled by the theme as many on this site, but it’s a perfectly good puzzle, with a fair number of easy clues to get one started on the well-constructed grid. The only PDM for me was the emergence of the theme. The rest was predictable.
I was slightly puzzled at the end that I couldn’t get it to work in the way I imagined it should, but then realized that one of the definition-only clues has three, not two possible entries and I’d plumped for the wrong two. With only one such ambiguity it wasn’t a major stumbling block, so perhaps it can be seen as a legitimate part of the endgame.
I didn’t particularly care for the second definition to 38. – far too imprecise for a definition-only clue.
It’s very unclear to me what precisely is to be written below the grid (despite midazolam's earlier comment). I can see two possibilities, both satisfying the preamble and both thematically accurate in different ways, that could be described as (5,5). As I shan’t submit it doesn’t matter.