Great stuff! It's a very close call but on most days this is probably my favourite mass by Mr Z - would be great if it was performed more. Your handiwork is not yet approved but the IMSLP mods but once it is I am very curious to see if you were true to Zelenka in bar 5 of the Cum sancto / Dona nobis in the first violins. That outrageous (and in fugual writing overall quite unprecedented) flourish does not seem to be in the published modern edition (Breitkopf) and is not played on the Bernius disc (it is however to be heard on the earlier, Guttler recording so I wonder if they performed from a different edition). I also wondered what you did with the Quoniam - when I recently transcribed that for piano (also on IMSLP) I noticed that Zelenka had been rather inconsistent with some of the figurations which recapitulate.
Perhaps you can do ZWV 14 next :-) It's the most bombastic of all his masses and it's begging for more performances too.