So after all my floating, and recalculating, I ended up locating the keel box right where I had originally calculated it would be. Which was great since I had already installed the main cross beam which now intersects the keel box perfectly! I was still a bit nervous cutting that hole in the hull though...mainly because yesterday it floated so well, it just seemed a shame to put a hole in it! The tricky part today was getting the boat leveled in all directions so I could be sure the keel box is installed straight on centerline, and plumb all around. I think I was able to meet most of those criteria so I epoxied it in position.