Mine weighed 5 lbs 12 oz ready to fly. I was a bit disappointed at the time because SIG advertised 4.5 to 5 lbs on the box. It didn't matter, it was still an excellent flying plane. I sold it over the winter after flying it for 4 years. I don't recall where my CG was but 3 1/2" seems very far forward. I seem to recall having mine around 4 1/2" back from the LE which was 1/8" forward of the CG marked on the plans. I later moved it back another 1/2" with very minor changes in flying. This design has a very wide chord that can tolerate a wide CG range and I think that the CG marked on the plans is very conservative. Maybe some other members can chime in here to let us know where their CG's were set. Having to add 12 oz to this design doesn't seem right. BTW, I flew mine with an MDS 46 and later a GMS 47 after getting totally fed up with the MDS.

Cheers!

Jollidude