Never ever use a CAD Modelling software for the creation
of 3D Modells.. !! expect you want to build that thing in realworld later. For Visualisation or Realtime Applications CAD Geometry is always the worst choice.
I could write now 10 sides to describe
all the problems that could occur with CAD imports.
(You probabely won´t come around a gmax import)
Not to mention the mapping coordinates you somhow
have to add to your model (CAD Software usually doesn´t
know mapping coordinates or unwrapping)
So better take some time and learn gmax. It´s not that
hard as many people think. Gmax offers the most
advanced poly modelling tools on the market for free.
I always say to myself... why driving Fiat when I can have a Ferrari for the same price

cheers