Lovely and thanks for writing the DIY with pictures. It does take a substantial effort, especially with pictures. Four questions-
1. Did yours had gasket material in the coolant when you drained it?
2. Was there any evidence of coolant mixing in with the oil?
3. I couldn't tell from the picture, but were you able to get the original finish back and remove all the old gasket material from the groove?
4. Is there a spec on the torque for the 3 bolts? or Should one tighten them to until they feel tight enough- like you stated.