Reverse Engineering Workflow

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FreeCAD

How to take models such as https://hw.menardc.com/main/items/media/DOLPH001/Prod_Tech_Spec/6704580dimension.pdf and reproduce them readily in FreeCAD. It is easiest to import the drawing into FreeCAD, set scale to be accurate, and then trace over the lines in the image. That is a great first-approximation for accurate design.

FreeCAD Architecture

You can use DWG format import to work from. See example by Yorik - https://wiki.freecadweb.org/Arch_tutorial

SweetHome 3D

Taking an imported blueprint, and re-creating it in SweetHome3D - http://www.sweethome3d.com/userGuide.jsp#importingHomeBlueprint