Trimmed and deburred the aft right side panel, including brace and doublers. Then tried to fit the aft panel into position. Major conflict on the top engine mount. Difference is because of the conical mount vs Dyna Focal. The conical mount places the plane of the aft panel in-line with the engine mount bolt/nut, instead of simply needing an access hole to tighten the nut.
Used the factory panel to trace a cardboard template. Trimmed the template to fit around engine mount, and traced the new cut-line back onto the aluminum baffle panel. Subsequent trimming of the hole provided good alignment.
Will also finish the forward right side panel tonight.