Bobby - brilliant list. Many thanks! Sadly SolidWorks seems to cost well over $1000 and is completely out of the question for a (very!) lean startup like me.

One thing: I am currently evaluating Onshape which appears to be freshly out of Beta.
http://3dprintingindustry.com/2015/1...pinshape-apps/
They now let you have 10 not 5 private 'documents'. However one 'document' allows you to store all sorts of data including a number of different models'. I won't be doing much collaboration (yet), and everything being done through a browser is of no use to me. Nonetheless being semi-dyslexic I do rather like their clean interface (makes Fusion seem very clunky) and their large number of training videos is also helpful. Whether it it any faster to work with I have no idea. More later... :^)