Take a cubby, make it flat
Make it long (forward, but not backwards)
Turn sideways (so there's 2 overlapping cubbys)
Place something (anything) at the middle front
Rotate cubby enough to get the piece asymmetric
Select the other cube to the one holding the piece.
Then rotate and resize until the cube isn't touching the piece anymore.
That piece and anything put on it = assymetrical
(Probably will need to reduce it to a single cubby, instead of a symmetrical double to properly release the piece from it)


will add links to templates for each vehicle type.

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asymmetry!
proof that i spend too much time in the building editor: