Thanks for your advice Berth, I'm specifically looking at designing Technic models with ease of use (or near to easy as possible) being the priority. My idea is to make a rough estimate of my designs on paper, in sections and then recreate the thing in the software. It has intrigued me how someone could create a masterpiece like the MOC Bugatti Veyron 16.4 Grandsport with a 7 speed sequential gear box, fully motorised! I'd love to know the process that they go through; Do they design the elements first! Do they just spend thousands of hours of trial and error! Does design software help! These are the things I want to understand. Does anyone have any experience with SR 3D Builder? Is there anything better for Technics?