Geetings from Portugal.
Congratulations for your awesome work .
I´m getting some experience with OpenSCAD and I would like to try do model the MPCNC parts in OpenSCAD. The objective is to try to adapt to 28 mm tubes with an internal core for more rigidity at a nice price and easy buying, see: http://www.motedis.com/shop/Tube-systems-28mm/Profiles/Aluminium-Tubes-28/Circular-tube-with-core-aluminium-anodized-28mm::824.html. Maybe nema23 should be used because the tubes mass more than doubles.
Do you see any inconvenience in using your work? After seeing the parts above are you thinking to adapt yourself the MPCNC to that type of tubes?
If not, can you facilitate some blueprints or materials to make this task easier?