I replaced the original electrical panel with high quality Blue Seas Systems panels and rewired most of the boat.  It was not particularly difficult, but was certainly a time consuming project.  I hired an electrician to check my work to insure I hadn't made any major blunders.  If I had it to do over again, I'd move the panels from the original placement under the companionway ladder to a spot outboard of the navigation station where rain or salt water would be far less likely to corrode the wiring and terminals. 

Ralph Richardson
TERRA NOVA
T-37 ketch #406
Portland, Oregon