I had to see for myself...That keel void thing...well, everybodys got one!
It started out with a little inocent dremel work along some cracks in the bilge. Some were deeper than others, and, there was a spot that just sounded hollow and weak. What the heck, I thought. I knew I'l have to do some 'poxy work in there anyway. Out came the 1/2" bit. It took little pressure and about half a second to pop through the little glass that remained.
I probed around a bit. Swore. Probed a bit more. Swore alot more. The only good thing is five years on the hard meant she was pretty dry in there. I hooked the shop vac up to it with the hose on the output and let her run/heat/dry for a couple of hours just for good measure.
After much more digging I decided to fill it back up with foam-it and seal it on the top side. We'll have to inspect the heel area well later on. Definitely before we dunk.