Add "Assembly Referenced Dimensions" howto

[ceremcem]

See OakLD's suggestion at FreeCAD forum:

You could/should use Spreadsheet workbench to drive the dimensions in a logical way. No scripting required, if I understand your scenario correctly.
I didn't get to fully test it with FreeCAD, but I used it a lot in SolidEdge many years ago and it's really worth learning. In example, I had a common product, a small tank with conical bottom and typical inlets and outlets done this way. So when we received order for a custom (always) tank of this type, I simply typed in diameter and height, saw the volume (to check if it is matching the request), modified in/outlets diameters and about 90% of work on drawings and documentation was done... Very effective.
I'm experimenting with a custom Library-type Workbench in FreeCAD to allow to make such input-driven models (and drawings too!) of common parts (brackets, tanks, links, connection plates, etc.), but I am extremely slow in the progress due to lack of time and lack of experience in the development environment used in FC...

[ceremcem]

https://forum.freecadweb.org/viewtopic.php?p=250190#p250190

[ceremcem]

https://github.com/ceremcem/assembly-dimensions and realthunder/FreeCAD_assembly3#52 (comment)