Animation is almost the best tool for assembly manual on the planet, by far, but...
Please implement "rubber bands" for transforms! A line with user selectable color, thickness and style (so it is visible against whatever happens to be behind it), from a point of a body to a point of another body. Without something like this it is very hard to show what needs to align with what in assembly.
I'm currently using screenshots with a third party drawing application. Animated video would be so cool, but without guide lines, more cool than helpful. 😞
