Yes it took me a year.
Old age and health issues are my excuses and I'm sticking to them.
Way back in my distant past I worked with 2D & 3D CAD at a $5000.00 per seat CAD station.
Complex machines were always created using layers for each sub assembly and part.
Having the ability to put different part attributes in a separate layer was strictly enforced as each part was added to a sub-assembly and then the design checked for interference, fit,and function.
Comparing working with layers to working with the hierarchy method in AC3D, the layers method wins hands down for speed and ease of use. IMHO.
I admit it is not an issue on assemblies with only a few parts or objects, but when you build an aircraft with many parts and add in animation, finding your way around becomes a time wasting issue. IMHO.
I would like to see more opinions on this subject.
Finally AC3D makes most other CAD software look and feel second rate.
Amazing! Many many thanks Andy!
PS
Parametric design was becoming popular about the time I retired. It made altering a design a snap. Possible in AC3D?
wheathe