It sounds to me that you do video rendering, not Computer Aided Design or CAD work. Video rendering time is hardware and soft ware dependent, you have good software so it's a matter of how much time you want to take to render something. I use my game machine to do that type of stuff, look at my sig.
Its not all video rendering but there is some part of it that is.
But my question still stands as to what specs I need (as described above)
Haha sorry just confused.