Building a puzzle book by hand means hours of laying out grids, checking every answer key, and then redoing the whole file when KDP rejects the bleed or the margins.
Everybody treats that as part of the job. It is not. It is a layout problem, and layout problems are what computers are for.
That is the shape of everything I make. Find the thing everyone has quietly accepted as unavoidable, then go and check whether it actually is.
If something I built breaks, you email me and you get me — not a ticket queue.