Hi David, drawings…being a tech myself, I can agree on complexity and even the schematics you are building from, tube I take it, are small too, but complex on it’s own merit and knowledge. Reading a diagram is what it is all about. What I find funny is all the drawings I have seen used for faceting or any mechanical drawing is they are to scale. Take the calipers and measure the drawing and calculate. Am I thinking to simple here and all those numbers, simple math again, How else does one figure out if they have enough material, math…can someone explain the volume formula and how that is used?