There has been arguments for years over the virtues of built up wings versus foam core wings. Foams are quicker to build but are generally heavier and tend to have more flex than built up wings. My 30 year old curare was peiced together from a MK wing kit (built up) a glass fuselage that I can't even remember where I got and a foam stab. It flew great but needs a refurb. I wonder if the epoxy's that I used back then have also deteriorated... and if the glass fuselage still has it's strength.