Senior Design Project - Quality Control Abrasion Machine

So, anybody who has done CAD and engineering for a while has at least one project that they can look back on and say, "Yeah, that was trash." That is 100% the case here. This was my senior design project in college. Task? Create a portable, hand-powered device to consistently abrade the outside of a different sized plastic vials for quality control of their coating for a local company. And the result was this beautiful machine that is a machinist's nightmare. So not only was this my first CAD experience, neither me nor my partner had any machine shop experience. The company should have gotten us in touch with their machinist/fabricator, but they didn't. And knowing what I know now, I hope that he didn't actually try to make this. Problems: welds assumed, not shown. None of the material is bar stock. Custom threads on the screw and in the vise blocks! Unnecessarily long, especially considering the extra flex that introduced into the linear rods. Physically unstable due to orientation and location of hand crank.