Although this can be done entirely on MoI, I find the combination of NURBS(MoI of course) + Polygonal modeller the best of both worlds.
If you're working with blueprints, trace the shape with curves and break them down so that they form large quads which you can surface with network, loft or sweep. You probably won't get a good quality surface this way, but you can then export as an obj, and inside your polygonal modeller and do retopology or shrinkwrap over it.
Here's one I did this way recently: http://moi3d.com/forum/messages.php?webtag=MOI&msg=11405.1

Good day.
I am still at it lol
What would be the best way to fix the fillet in the corner?
attached pic and file

Tnx!

Hi Matadem, it looks like the opening there is because these 2 pieces are separate objects and not joined together:





If you join those together so they are connected then fillet will be able to trim the upper surface instead of opening up a hole.

I've attached a fixed version that is joined, if you repeat the fillet here you shouldn't get that hole:





- Michael