Else with the _Vclone above by Max Smirnov ;)

Of course you can take any objects (volumes, surfaces, curves) here a simple rectangular surface :)
And the scale of the objects can be adapted to the "vectors sizes"!
http://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=c503c7b9654fd39241658b2612cc9bc3&filename=vClone.v1.0.zip

So the only difficulties is draw the vectors on the branches!
Here vectors have the same size so rectagles also !)