Just my opinion but I would say the difference in value between an original cp with a messed up overlay and one with a new willis overlay would be about $5-10. Not worth the time, effort, or the overlay IMO.
Yep you hit it. The physical effort to strip, prep and replace the overlay with the poopy willis (plus the cost of the actual willis) is more expensive than the darn 5 bucks you might get extra for the panel. Sell the panel,then sell the overlay and save yourself an hour of work.
