Here's annudder suggestion. FX Hobbies make ARF SPADs, their main claim to fame is their wings, they are nice, not the usual sharp leading edge you see on many SPADs.
I know your way up there in altitude, and these SPADs are a lit' on the heavy side (mine weights in at just under 7 lbs) so it will take more than a 40. But it will take some real abuse.
Just me 2cents, probably not worth a penny.