Hello,

You can probably do this in MoI using blends but it's much easier to do this with something like Rhino and VSRs surfacing package. Only downside is that the combo of those two packages will set you back $2K. That's probably your least expensive alternative, with pricing going up from there.

It would be best to model this shape without the wheel arch cutout.

Then after creating the network surface, you can then use trim to cut out the wheel arch.

Strangely enough I had to pick the curves in a certain order for network to work. If you just select all the curves with a crossing window it will give a bunched up result.

You will find some car modelling tips here http://moi3d.com/forum/index.php?webtag=MOI&msg=6512.1

I do agree with Andrei though, polygons is the way to go for organic shapes like cars and aircraft. It can be done with nurbs but you really need a package with a very advanced toolset that would cost big $.

I might make the wheel arch 2 pieces that meet at the top. Not able to test this is out at the moment but I believe I've done this int he past.