Is this anything like the Playboy that Roger Barrett flew way back?Dave
I found the kit supplied "box" beam was way too heavy, so made my own from balsa. Mine was made of some type of ply for the verticals.
This is my Playboy built from Bill Sawyers kit. It flies ok but it's heavy at 50oz. I replaced the FP40 with an LA46 but haven't tried it yet. I just sort of moved on.