autocad accepts only lines. I tried to build solids and extract the edges to see if he accepted the solid cage at least, but he kept accepting only lines. However it is a useful plugin.
autocad is far from being a real solid modeler, so if you want to work with complex solids it is better to evaluate software that also allow to deform solids with ease
Just to give an example, image 1 summarizes everything I've been able to do with autocad.
other images are the result of the application of 2 3dsmax modifiers with which it is possible to deform solids with extreme ease.