Full rebuild includes crank bearings, main bearings and crank work as necessary after tests and inspection. Half rebuild includes piston/conrod/little ends inspection and replacement as necessary, valve and spring replacement and regrinds, guide replacement or honing, ring change and barrel honing, port cleaning, thread repair.
Half-rebuild is the norm for a rebuild , unless full is specified. In the UK we have a 'gold seal' standard carried out by specialist workshops, costing around £1, 200 for a xantiqa diesel I think. That makes yours expensive for the Balkans especially, he's charged a lot for dismantling. I would guess he's just replaced rings, possibly done honing, by having the block honed, but I guess just a de-glaze with a drill. Proper honing takes speciality engineering equipment and is precise. Garages don't normally (but may sometimes) do rebuilds beacuse the workshops are cost-effective and standards generally higher - also it's time consuming to take stuff to the engineer for honing etc., With specialists for older cars mecahnics more often get invloved with rebuilds, and generally mechanics will sometimes do partial rebuilds - honing and rings, and even head work, or just replace one burnt pistion etc..
Specialist performance mecahnics go further...

have more quipment for the job, : and are good friends with various engineers, enjoying a good beer with together, possibly having swapped girlfriends in their younger days, and still remained friends.
Haven't a clue how your legal system works, but if it's unusual it won't be very corrupted or twisted.

Anyway, you might start by requesting in a 'notice and demand' for receipts for parts supplied in order to be able to get a look at what's been done; Stating on it why, because the work has left it in that condition, and in order to eliminate doubts. Failure to reply defaults to work carried out not according to spec. But then 'rebuild' could just mean rings and hone. So no real joy. Your rebuild order gave no spec. So all in all , I think no joy there.
Sounds like you're handling it in good spirit, which is admirable. 'Worse things happen at sea', and that experience will stand you in good stead for all business.
Best wishes.