Well the uprights could be straight rectangles and still get the full x travel. I mainly did it with the angled uprights because it looks better. There would be reduction in weight with the angled uprights, which is never a bad thing. I have long studied design as a hobby, my father was an Industrial/mechanical designer for 27 years. All thru history you will find things that were built that look good. One example, arguably one of the best looking fighter aircraft of all time, the North American P-51 Mustang fighter of World War 2. One of the designers was interviewed after the war and stated that the airplane looked good because they set out to make a good looking aircraft. The first models of the aircraft placed in the wind tunnel showed that the better looking of the preliminary designs really was a better design. I have always found that I like using something that looks good. A good looking car, boat, RC airplane, or power tool, will always be purchased first all other things being perceived as equal. So I am consciously trying to design a good looking machine, within the limits of feasibility and performance. That is why most of the edges of the machine will be rounded over, it just looks better and your edges also last longer. We will see how that pans out.
