I had a dealer install the setup three winters ago during their slow period when I switched from a mooring to a slip. Shore power inlet, 6 breaker panel, one 110V GFI outlet, one two-battery charger and a spotlight was about $1600.
Was put in a 2530 so the charger is under the galley cabinet. The breaker panel is in the electric panel in the vee.
Panel is from Blue Sea. Charger is from Guest, though think model was replaced. Is a 2820 model, that does 10A to each battery and is automatic three stage charging.
The chord connection is Marinco and is mounted so that the interior wires entered the fuse panel in the vee. The 110V outlet is on the front face of the galley. I may add one in the vee.
The AC breaker will take up two of the breaker spots for 30 amp shorepower service for whateve size panel you think of.
You can do the work yourself but you have to make sure the grounds are done right for the 110V AC service and the boat's 12 V system, and that good size wires from the charger are run to the batteries.