spilts and cracks are easy to fill with todays modern methods ie wood filler and sand down and repaint,,but if you are thinking of repacing a panal its not that hard,,take off the damaged panal and use it as a teplate for the new marine plywood and get the same thickness wood as the old one and if you are useing screws to screw in the new panal use stainless steel as brass ones will weaken in time,,dot forget to seal the frame before you put the new wood on,,if you have enymore questions email me at barryluke1@hotmail.com,,ps i was a boat repairer but lost intrest in wooden boats,,dont be afraid to take old panels off try to find the old screws first and take em out
barry
May 2008