Wow! Thanks. This was the best freecad video I have seen. I have spent about 80 hours watching and trying other videos and I have learned more from you in 14 minutes.

Very nice. Thank you.

I don't like using faces of bodies to orient other sketches. I've had nothing but problems with doing this, due to the topological naming problem, which decides to show its ugly head later in the project, when it becomes a nightmare to try and correct. I've been burnt too many times by this. I learned the hard way to keep references to shapes separated from bodies and surfaces. Ok to link to external geometry in another sketch, but not to other bodies or surfaces - nothing but trouble IMHO. Hopefully, the topological naming problem will be substantially reduced in future versions of FreeCAD. I know they are working on it, but it is not an easy problem to solve. BTW, Your videos are really good, and I learn a lot from them. Thanks.