Nah if you look closely you will see a soft balsa frame supporting the cutout and hatch,sop,hinge quality is good too.Yes that moki 400 sure does it(look it up you other lazy so and so's,it's good).My favourite for sound and i so so wish that saito would make something similar is the kolm engine in the 'galloping ghost' flown at low level in europe.What a sound,if saito has one in the pipeline someone yell out cause i'd put that in a mk5 spitfire as soon as tomorrow.
Dave are you running the engine in for someone else or is it yours?