I would suggest adding a weight box to bring it up to competition weight of 150 lbs with bumpers added so they get used to size. Then test with different motor configurations while driver training. You will gain more from this than drivers just getting used to controls. Your programmers can use this platform to test autonomous modes as well. A light robot will have very different characteristics than an "up to weight" robot. Also, corner braces to stiffen the chassis from racking, along with a shear panel or belly pan.
