After a couple of failures with Sketchup and considering how unwieldy it becomes when trying to do anything with roundedness in it ( a swept elbow joint for instance), I have decided to learn Fusion 360.

I tried a couple of Youtube videos, but after a few minutes of an irrepressibly chirpy Californian youth going on about cloud storage, I decided to buy a book. Just need to wait for some peace in the house after the grandchildren have gone home, before I can get down to study it!

Rob-T