Trimmed up the tabs and installed nutplates. Then, with the cowling halves secure on each side of the spinner, carefully filed away the cowling so the metal rings fit properly in each large vent opening. Sanded and acetoned the inside in preparation for pouring resin to create the key for the rings. Should be able to do that first thing tomorrow.
Tabs with nutplates
A view of how they will match up
Tabs secured, and rings are now ready for pouring the key