I see they suggest using AutoCad and creating 2D part drawings...and you say that you don't have AutoCad. There are quite a few FREE 2D cad packages available that will create standard dxf and dwg files. I use LibreCad at home and Autocad at work and have had no problems sharing projects between the 2 apps. Might be worth a try and LibreCad is a LOT easier to use than AutoCad.