Whoever had to weld that mustve been happy
That scale looks a lot like the one we were using. I wouldnt doubt that that all is 47 lbs, but the scale we were using said that our prototype bot we made in the last few months weighed in at 135 lbs, when it was really 110 lbs. We got some weights from our weight room and found that the weight almost varies exponentially.
Basically, you might want to be careful using digital scales, or go to the post office and weigh something, then come back and compare it to whatyou get on your scale.
Cory