I'd point out that Lithium-based batteries are FAR MORE SENSITIVE TO CHARGING VOLTAGES. You need to have a charger designed specifically for Lithium batteries. Overcharging them usually results in really bad things happening—like bursting into flames.
Whatever saving you gain in buying the batteries you will likely lose in buying the specialized equipment needed to properly charge them.
As for replacing your DC panel—BlueSea makes a great variety of fuse and circuit breaker panels that would be suitable.
As for the Shorepower setup, it depends on how complex a shorepower setup you're looking to have. For a boat the size of yours, I'd recommend getting the shorepower panel that looks like this:
Which is available at Sailorsolutions.com.
For a 27' boat, you really shouldn't need more than that.
The main difference between wiring a boat and wiring a house is the type of wire used and how it is terminated. Boats move, and as such, the wiring used must resist fatigue that is cause by vibration and movement. Boat are wet environments, and boats on salt-water have the added corrosive effects of salt to deal with. Marine grade wire is pre-tinned for corrosion resistance and finely stranded for fatigue resistance. Proper marine wire termination consists of using adhesive-lined heat shrink terminals. The adhesive allows the heat shrink tubing to fully isolate the crimped connection from the environment and the crimped terminal gives a solid, reliable and mechanically secure connection to the wire and terminal. For more information on how to terminate marine wire, see Maine Sail's excellent tutorial. Of the brands of marine wire available, I like Pacer and Berkshire over Ancor due to their greater flexibility and much lower cost.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.