I was surprised to see my year old thread pop up again. I figure I could use this as a 1 year update:
Keelguard: The installation of the keelguard was quite easy and it remains attached perfectly. I sealed the edges with 4200, which others on the HullTruth recommended. I am not sure if this was necessary, but based on the scratches on it, I have hit a number of things in our many crossings to Catalina. Nothing major, luckily, but there is some piece of mind that there is a piece of rubber up there. We keep the boat in the water, so I like the fact that I no longer have screws below the water line.
Hatches: By far the single biggest improvement we have made to the boat. The drawers that I created for the cabinets are a close second, but the hatches allow us to keep all of our extra anchors, sleeping bags, extra lifejackets, etc. up and out of the way. In conjunction with the organization of the drawers, the boat is incredibly organized and we have spent about 50 nights at Catalina this year since the upgrades. You can not feel the hatches through the mattress pads. This might be aided by the fact that I added 1.5 inch memory foam to the top of the pads when I reupholstered them.
If you are thinking of cutting in v-berth hatches, do it. It is a dirty job, but totally worth the effort if you spend lots of time aboard your C-Dory.
-Tim
CPelican