It's all coming together, though time is a little tighter than I'd planned for.
Some of the definitions of terms take you down deep rabbitholes, as defining them gives you many other terms to define, and a bunch of AKAs and near AKAs.
I started this checking stage with 8,000 terms and I have more than 10, 000 now! It took 3 years to get to 8000. I'll be adding 25% to the content in two months, whilst carrying out final QA checks before submission. Its been more or less full time work for two of us.