I had a need to add an additional 12V breaker panel to our Island Packet 420 C Ghost. In searching for a perfect place to put the panel, it appeared that the forward side of the inside of the original breaker panel enclosure might just fit. I measured carefully and determined that the Blue Sea 8 position 12V/24V panel (5.25 x 7.5 inches) should fit just right. Shown is a picture of the IP420 Nav station, and then a close-up view of the forward side of the breaker panel enclosure where I intended to mount the new expansion panel.

Here is the view of the opposite side of the panel (inside the instrument panel cavity) where I outlined the hole to be cut for the expansion breaker panel.

A Dremel tool worked perfectly to cut the hole within which I inserted the new Blue Sea panel. There is enough room to mount a 2nd expansion panel below the 1st, however the cutting and mounting will be a bit trickier since there is more likelihood of interference on the back side of things mounted on the instrument panel. The wood framing is thicker there as well.

Just in case you were wondering, I had 1/16th of an inch clearance available to fully open the original IP upper breaker panel.

Here is a picture of the backside of the newly inserted panel. There is plenty of room to easily access the back of the breakers for wiring. You can see the additional layer of wood in the section below the new panel which will make it a little more difficult to cut and mount another expansion panel below it.