first understand the split diode. it is only splitting the alternator
. the charger is just using it as a junction point. the charger is using 2 outputs going to 2 batteries the diode is irelivent, it's just a bolt in the middle of the charger wire.
if it has a 3rd I would run it to the gen battery for maintenance
. but if you run the gen often it is not needed. if the boat
sits unused all winter with shore power
it's a good idea. run direct from charger to battery. not diode block
the victron 700/702 is good. it only monitors one battery. the house, you would have to rewire your main battery negatives to make it fit, with a common neg bus bar. instead of daisy chaining everything.
solar would go to battery pos and new neg bus bar. shunt goes between house bank and neg bus bar.
50a alt is pretty small. and diode blocks are old school
. a big alt run direct to house bank, with a ACR / echo charger would hugely increase your charging
get LED cabin
lights! you have over 20a of lights listed.
hope you have some more fuses
in the diagram not listed.