The toughest part, Bob, is when they keep telling you that you should never make anything without drawing it first. I never could bring myself to draw things that I was going to make myself, unless I was unsure that the geometry was feasible. I did, and do, usually sketch them though. I'd rather do the thinking before the cutting, rather than after. Unfortunately I then tend to have a better idea or two part way through the construction, and keep redesigning as I go. Working to a settled design is just way too boring to contemplate.