I'm not sure, but if I recall the fuse/wing weighed 5+ and the radio/engine took it to just over 7lbs. I did not use wheel pants though. I also changed the wheels.

The plane was written off in a midair, I checked the wing and
it did appear to have quite light balsa in it, I guess this could vary
somewhat.

Saito 100 is not a very heavy engine also.