Hi Blindfoldjump,

I'm also trying to create concept cars with sub-d modeling and with nurbs and moi3d too.Many years ago I have tried to learn to create my concept cars with 3ds max,then I saw blender3d is improving it's tools often so I decided to learn blender3d sub-d modeling.Today I'm pretty good with 3d modeling cars,airplanes so I'm selling my 3d models on online 3d stock markets.I must admit I'm not very patient with smaller details.Three years ago I also decided to invest in graphic tablet and I'm practicing my sketching with autodesk sketchbook pro in my spare time.I'm selftaught designer(enthysiast),but I'm giving my best to represent my concepts best I can,to learn and to always improve my skills.Even I've never finished design or art school I worked as graphical and industrial packaging designer,where I learned to work with Rhino 4.0 and promissed me some day I will invest in something similar in the future,so I invested in moi3d.I also learned when I worked 1 year as industrial packaging designer,that nurbs and cad are industrial standard,but today maybe it is different so people who create sub-d models also has their part in creation real prototypes.I know back then, when I designed a bottle in blender3d(sub-d modeling),I also had to build it in rhino3d to be usable for real prototyping.Anyway because my passion for cardesign I learned to build my ideas with blender3d and with moi3d,but as Michael Gibson told you patch by patch without continuity in surfaces.More often I have the problem to create fillets for my sharp edges,if there would better tools for that kind of operations it would be awesome.My method of work when I create my concept cars is next.I create pretty fast car with blender3d,if my client like it I then use this 3d model as a reference and I simplify it or change design in moi3d V3 version.My aim is to create even better design with moi3d,then I create it with blender3d sub-d modeling software.If you want to learn sub-d modeling in blender3d you could check it on link below.

http://cgcookie.com/blender/cgc-courses/modeling-motorcycle/ for this course you have to pay 18$ but worths.I payed it for 1 month and I learned a lot.Also on that website you can find other free tutorials.

http://cgcookie.com/blender/cgc-courses/modeling-a-porsche-911-gt3-rs/

Check my 3d models created and designed with blender3d on my behance portfolio if you like.
https://www.behance.net/zenox3d

That was sub-d modeling now on links below you could check what I have created so far with moi3d,what I think looks pretty descent.
http://www.cgtrader.com/3d-models/aircraft/sport-private/honda-jet-private-aircraft-restyled
http://www.cgtrader.com/3d-models/aircraft/commercial/boeing-787-8-comercial-aircraft-cad-model
https://www.behance.net/gallery/15975325/Exona-2-stylish-concept-CAD-project


I've learned a lot on how to build my 3d models with moi3d by watching tutorials about rhino3d and particulalrly with solidworks.

https://www.youtube.com/watch?v=V71WJkLuZq4

Anyway I hope so this post and my advices will help you to chose the right tool for your workflow.