I really want to like this one: construction ingenious, but some of the clueing is a bit chewy and the definitions a bit strained for my liking. Shame, because the way we get four successive matches for 1a is so delightful.
Btw, add me to the list of those who guessed the final form, as I couldn’t get the 29ing to work even after finding all the names. However, I persevered, and cracked it in the end, and I’m glad I did because it turned out some of the gibberish I was getting was because I had a wrong entry!
I sympathise with those who do not like 29ing, especially some of the fiddly forms, but in this case I found that Googling for “online X 29er” provided everything needed with a minimum of faff.
I do have a few parsing queries, if anyone can oblige with a nudge. For 8 (“sedative stupor indeed penetrates Jack”), I see the definition, and fragments of the wordplay, but can’t quite put it all together. For 12 (“Rounded division, one sort beyond clod”) I again see the definition but haven’t a clue about the wordplay. For 25, I have most of it, I think, but am struggling to explain the middle two letters from “in preference to”.