Hi Yannada, thanks for the links, I have tried alias studio before buying MoI in fact.
I was impressed by this work:

http://forum.hardware.fr/hfr/Graphisme/Infographie-3D/solstice-pontiac-classe-sujet_28322_1.htm
(in french, but the images speak alone)

Sure many techniques are possible to translate to moi, except all the curvature continuity related stuffs :S

@Pilou

You can find the sedan tutorials on rhinotv
http://www.rhino3d.tv/english/info/

If you don't want to register, I can send you the .rar file (+- 20 meg)