Well done Ian !
While you are about it you may consider fitting an external regulator that will charge the house batteries correctly
There are a couple of ways of doing this which are illustrated well in the files section.
The problem with the internal LN regulator is that is delivers 28.8 volts... forever....., and that will eventually kill your deep cycle house batteries if you motor for long periods.
If you do motor for hours you need to have a system that will deal with charging your deep cycle house batteries in a 3-stage manner ...if you want to prolong the life of your batteries.
if you have plenty of money to spend on batteries then I guess it doesn't matter.