Had to give it a shot, CW! Can I ask if you have OR gave consideration to chopping up the original grills. IF the speaker cone resides directly beneath the factory grill cutout (and I don’t know that it does) then cutting a concentric hole to size and recovering the top of the factory piece seems like it might be a little bit easier to work with given that the factory clips and slope of cover are pre-existing. Just a thought I slept on last night and would value your feedback on…Please.