Rotation & angle of universal joint?

[Philippe Hurbain]

You don't need an angle, just apply the same orientation the script applied to the second universal end (or the axle snapped to it).

This is what the ctrl+home combined with the relative grid does in my above sequence.

Part of the problem is that I'm not sure what part/end we are speaking of...
Orange parts are the chassis, grey parts are properly placed (I am supposed to be after step "90 deg to align with the axle again."), but blue and white parts are not properly connected.
Maybe I'm dumb...