All done!
B****y hard to start with, as always with carte-blanche grids, and Sabre's usual fiendishly obscure clueing - with just a few surprisingly (misleadingly?) obvious ones to sugar the pill (struggled for a long time to make ANTSY fit).
The discipline needed to project the symmetrical layout was also essential and challenging - but once the tipping point of solves and the PDM were reached, a lot of by-no-means trivial fun to completion, and some ultimately very entertaining clues.
Having said that, I've got 5 entries that perfectly fit the definitions in their clues, but cannot fathom out the parsing of the wordplay - no matter - quiet enjoyment sorting those out with no pressure.
Thank you, Sabre.
And special thanks to JB