There is a lot of good information in 1192 as regards pipe sizes, ventilation, labels etc. Not a waste of money at all in my book.
If your bus is done properly in marine wire, I would not replace it. I am something of a code wonk and would not have used it in the first place. Ripping it out and starting over is an over reaction in my book (but maybe not in yours
As to using 10 gauge, your 30 amp circuits at home are all dedicated, water heater, dryer, etc. and they pull something less than 30 amps. Chances are that the feed to your inverter/charger will be right at 30 amps a lot of the time. Thus the advice to upsize, though not strictly a requirement.
You may be able to check out a copy of the NEC from a library and copy the sections you need (probably less than 10% of the book).
Very simplified, except for isolating the neutral, RV wiring is very similar to regular house wiring as far as the code goes. It is more similar to wiring a mobile home which has the same neutral requirements.
If you feel strongly about not using solid wire, you might as well keep the boat wire. Doing it over in stranded will require using conduit for stranded wire. (There is no stranded Romex in the smaller sizes).