On a stock sport boat, our boat manual is very small and says very little. Mostly things like cleaning the various materials and the hull warranty. It's obvious they assume the massive collection of equipment manuals is enough.
On a semi-custom we got both digital and bound a huge collection of information from the builder. We have every diagram they worked from. Electrical, plumbing, waste. Full detailed specs and blueprints. Every product listed, every material. But then we had that from the start of production. Part numbers, specific wire used. There is also extensive troubleshooting information as well as warnings and instructions in the event of various emergency events including things like running hard into a rock bank and compromising the bow or across something and ripping the running gear out. Some of the detail is surprising. Simple things like how to get the life raft down and launch it. While the basics are things they've done often in building 40+ of the model, it also includes details like furniture, mattresses (which we selected through our vendor), even the China pattern and vendor. Even though we have manuals for appliances, the master documents do show the equipment model and serial numbers and manufacturer.
I guess if I'm buying a stock boat at a modest prices I'm satisfied with one level even though I think they should provide more. But if it's custom and more expensive then they need detailed specs to build it, so provide me that information plus some.
