I did hear a significant widening and raising of the soundstage this morning when trying a number of new panel placement angles(off axis rotating away from my listening chair). Very happy with the results.
..and I think I have a final design, considerably trimmed back from yesterday. Trim is extended from stock by 1/2 inch. With the round-over it'll be effectively less than that. Just enough to show some wood trim around the grills. But..finishing the SVs comes first.