Step 7: 5.1 Base plate
The base plate is cut from ABS plastic plate with a paper cutter knife. It would be much efficient with electric tools like angle grinder.
In the photo, the left-lower part is the "pool" and from that goes the 1st, 2nd, 3rd and 4th flume to the right-upper. You may noticed that the 3rd flume is wider than the 1st and the 4th wider than the 2nd. Thanks to perspective these flumes would be looked as if they have the same width. Later we will talk about the differences of the tubes' diameter and of the two dimensional geometries and both are meant to enhance this obligatory perspective.