SP, We've built and flown (RC) many a successful foam wing out of the beaded board ... and you have the Thicker 3" which should be fine with a little wood bracing in stressed areas (as per usual) ... The T2 and similar glues will stick well to the beaded foam ... but Gorilla Glue would probably be best for joining panels ... You've probably seen all the tricks everybody uses to join it and add framing , etc. all very useful ...
It's like the old saying , if it doesn't look strong enough , use more foam ... make it thicker ... You'll appreciate the insulation factor too ...
Beaded foam might just be the Thrifty Alternative we've been seeking ... ???
