All done! Bass is amazing, zero peaks/dips, just solid low end. It turned out more efficient than I thought it would be. With drivers mover a millimeter or two maximum, the output levels are shaking the walls upstairs. No vent noise/chuffing that was obvious. I did run a flush cut trim bit on both ends of the feed to the vent so there aren't any mismatched wood joints... The surrounds sit about 1" behind where the finished drywall will hang, so between that and the 3/4" for the grill frame clearance will be perfect... The grill will be 36" x 60" and will be stretched with white acoustic cloth... I always liked IB, it has just been forever since I have been able to enjoy it. Everything turned out great, I wouldn't change a thing...