RE: #5, there are two different places to look for cracks. At the boat to stubby and at the stubby to keel. Small cracks on the outside are not necessarily a problem. The amount of flexing of keel when shook suspended in a hoist is impressive. Quite a bit of flexing can be normal. I put a few marks on your photo where to look for cracks developing and expanding. I had a keel problem, so I have seen these. My boat actually developed a leak, since repaired. The cracks that you would see from the inside are easily visible. You have a few small cracks, marked on the photo. If it doesn't leak after a hard sail in some steep chop, it will probably be fine. I guess the previous owner may have epoxied the keel bolts to prevent water going down and around the bolts. This is not standard, but I can imagine why someone would think to do that.
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