After seeing pics of your plane, what I would do is just make a hole in the firewall to clear the Saito carb and then use the metal mounts. The structure looks very light so i would reinforce it as much as possible without adding too much weight. Carbon fibre purhaps? Just curious, does the FG30 produce that much more power than the 26i? Of course no stinkin' 2 stroke is gonna sound like a 4 stroke. ( I have both!!) Good luck