Reading this has been very interesting!
I've just had my engine fully rebuilt by Courtenay. I know they had to change engineers from a local firm for various reason and the people they now use use to/do the works teams engines. So mine should be fine (in theory).
I must admit, as many have, its just a case of bolt together. then again the couple of engines of witnessed rebuilt have both come back with the bottom ends fully assembled so, assumingly they are correct.