With the distance the counterweight falls, we end up seeing a bit over 400 lbs of force on the frame, but most of that's downward. If we decide to weight it down, we'll do some calculations to make sure we get enough on there. We're more likely to stake it down, though. The holes are already drilled for it, and we've already got washers and one-foot-long steel spikes so we can get a solid footing without damaging the frame at all. And thanks - I agree about the dangerous look; I love having the thing sitting in my bedroom. Thanks. SolidWorks can draw quite well in either 2D or 3D, and can also display, print, and save any 2D view of your 3D model.