w..jack,
Yeah...mine was too. With some help, I rebuilt my chart table to accommodate the eBay panel, give me a flat surface, and re-wired the entire boat in the process. However, one note, I still ran a 12v feed to the old panel for many seasons while I slowly relocated old circuits (i.e. running lights) - it took a few years to get those new wires run to the more remote areas of the boat. I still don't have any cabin lights on the stbd side of the boat, except in the v-berth.
One more note. My Gr29's are the same foot print as a Gr27 I think, just a bit taller...they barely clear the settee, but they fit..not sure if they would fit under the chart table..I store too much junk in my chart table locker, so I didn't want to put batteries under there that I could not get to easily.