I have been doing these conversions for close to 8 years now.. I started with a 32 inch wingspan Fiddlers Green P-51 .. remarkably she flew and rather well .. so over the years i have done over 50 conversions .. Here is the mid point of my latest attempt .. a Fiddlers Green Grumman Goose ... 1/4 inch Bluecor insulation foam (From Lowes) .. I copied and enlarged the plans in Adobe illustrator and printed them out on my Plotter printer .. The hardest thing about converting them to 1/4 inch foam is accounting for the thickness of the foam when doing formers and where 2 pieces join together .. like fuselage sides joining the hull and top .. I will post more here as i make progress if there is interest .. I had more photos but my other computer is down with a bad power supply .. Pics are Below ..