Here's the driveshaft tunnel I mentioned. The point is to emphasize function; to show what's happening inside it, and to highlight the fact that the motor is directly driving the rear end - no gears needed. I will probably revisit the section where it switches from tube to tunnel, and give it a rolled, gradual, transition. The front, tube and boot, sections will both be two-piece parts, with hidden lower panels, to allow slipping them over the u-joint and shaft.
