the good news: Looking at the patent application, it looks like fuselages fall outside the scope. Patents are aimed at companes and anyone is free to use coroplast or similar material for their own use and not for profit. However, if you win a prize with the model ....
Rest of the bad news: 1/ Patent is world wide (This globalisation thing again).
2/ I don't think there's another company big enough to take them on unless anyone can prove there was a commercially available kit from a third party prior to the application, or other documented evidence to dispute the applicants' being the inventors.
Just how many more applications are being filed behind our backs. There are a lot of other ideas being aired on the forum that could be fodder for similar sharks.