The only comment that comes to mind right now is your Main DC overcurrent protection. You show a "Shunt" on the house batteries and nothing on the starter battery.
By "Shunt" I would take it that you mean a shunt resistor. A shunt does have an Amp rating which burns out at a certain amperage. It does not provide any other type of protection, such a short circuit protection and does not have an "opening speed" type curve. I would highly recommend to put a fuse as DC Main overcurrent protection.
By the way, you mentioned Blue Sea, and their website has a lot of information on their resources section. This is the overcurrent requirements per ABYC:
DC Main Overcurrent Protection Requirements
ABYC standard E22.214.171.124.1 states that each ungrounded conductor connected to a battery charger, alternator, or other charging source, shall be provided with overcurrent protection within a distance of seven inches (175mm) of the point of connection to the DC electrical system or to the battery.
The exceptions to this are:
When the conductor is enclosed in a sheath or enclosure such as conduit in addition to its insulation the 7" dimensions can be increased to 40".
If the conductor is connected directly to the battery terminal and is enclosed in a sheath or enclosure such as conduit in addition to its insulation the 7" dimension can be increased to 72".
The conductor connects to the starter for the engine.
Figure 1 below shows the location of the circuit protection devices per ABYC standard E126.96.36.199.1
1982 Gib'Sea 105
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