So what is in your boat toolbox?

Two boxes. One regular toolbox, kept in the head's vanity cabinet for
reasonably quick access. The other is a plastic ammo-box style one down in
the engine compartment between the two engines. The stringers are spaced
'just right' for keeping it in place. There's also a generic 100pc socket
set stowed in a cabin locker.

The engine box has spare impellers, hose clamps, volt meter, long
screwdrivers, duct and silicone tape, a hammer and the larger box wrenches
needed for mounts and such. The regular box has various screwdrivers,
pliers, and the same stuff you've got listed in yours.