I can't see it in the picture, but if you haven't done it, I would
drill to 1/4" holes through the engine mounts and balsa crutch and epoxy in some 1/4 " dowels. I also usually cover the engine pod out to an 1" or so with fiberglass cloth for strength. It might sound a little over board, but I still have a Voodoo I built on the carrier in Viet Nam and it's still strong and no cracks. I run mine with a reworked G21-35, 9-7 Rev-up, pacifier tank and about 25% Nitro. I use to use 40% Nitro when I flew competition.
Have fun and practice turning around real fast or doing a lot of maneuvers while standing still.
Have Fun and Merry Christmas.

Bruce