My 2001 Minnie Winnie experienced the exact same fate which I discovered and fixed in August 2013, two weeks before departing on a vacation, so that was my motivation to fix it promptly. The 16" (If my memory is correct) wide by 102" long sip panel was shot from water intrusion from the metal double C channel on the rear of the panel from water being forced up and to the sides of the cab over. My approach was to pull off the front filon from the front wrap and under and let it hang. Replace the 16" sip panel with 1/2" plywood glued and laminated to make one piece 102" long, 16" wide by 1" thick. This piece needs glued and screwed to the aluminum side frame structure. Then re glue the filon back around the nose with good quality contact cement. The double c channel needs to be sealed with 3M fast cure 5200 marine adhesive/sealant along with the curved front side seams (inject into voids flush to surface). I glued white Formica onto the plywood panel for the interior finish which looks great before I glued and screwed it in place. For the front curved side seams I put butyl tape underneath the aluminium decorative trim and sealed the edges of the hoops with 3M 5200. No issues now for the 1 1/2 years since the fix and it feels more solid and stronger than new with the plywood panel. The only compromise is weight of plywood vs. SIP panel and reduction of insulation ability but that is minimal. I may be able to post pictures if I can find them. I hope this helps give you with insight into a solution. The problem can be resolved!
