Here's the 'during' photo from Saturday's epoxy fill. I mixed 60 minute epoxy with black walnut sawdust.
A second lesson is to use fresh epoxy. This epoxy was some I had lying around and it cured very slowly. I was concerned that it was not going to cure at all.
I purchased some fresh slow-setting epoxy this weekend and will use it to complete the fill, as the area on the leg bottom did not completely fill because the epoxy was too thick. I'm thinking that West Systems epoxy, as Marc Spagnuolo used in his 'Fixing A Knot' video, is the proper viscosity to fully fill the void.
I'm hoping the Loctite brand that I purchased at Lowe's will also do the trick. If not, I'll head over to the local marina and plunk down $60 for a West Systems outfit.