mass properties and surface area

SF 2009-10-16

I have really not had the time to ever mess with mass properties before, but looking at this, I don't feel comfortable that the information that is presented here is correct. Breaking down the surface area myself I come up with around 490.5 ft. the number that is here breaks down to 907.59 ft. so after seeing this I also don't feel comfortable with the weight, since we will be picking this up with lugs and installing it, I cannot afford to have incorrect information. is there something here that I am not doing correctly?Solidworks Assemblies