Where is the vertical design, can't see it in the last few pages? For equal weapon weight, vertical spinners have a huge advantage although they always seem harder to build. Horizontal disks are an outdated design; they don't have the efficiency of vertical disks or drums and they don't have the reach of horizontal bar spinners. IMHO, if you are going to do a horizontal spinner, you need a weapon with a wider diameter than NST to have any chance of a podium position.