Drilled a representative sample of #40 holes across the underside forward spar, the triangular inboard patch, and several #30 holes in the underside trailing edge for temporary rivets.
De-riveted the #? rib to bend and move slightly for better alignment and filed the forward tab edge for better clearance with the forward spar. A slight bend in the forward tab centered the forward rib edge.
Flipped and removed top trailing temporary rivets. Cleco'd bottom trailing edge. Compressed and aligned top substructure.
More 'cautious' align/drill/examine then previous stabilator using 2x4 and webbing to compress. This method provides a greater opportunity to slightly adjust the subframe.
Outboard rib has a bit of cant to pull into vertical.