4040 Extrusion profile Rail system

I got hold of some custom 4040 t-nut extrusion profiles from a friend and i wondered if i could use them for a big 3d printer.

This is work in progress and the last trial-and-error cycles showed me this could be a long way ;-) , but maybe anyone out there is interested...

At least some parts are functional so far (look here: https://youtu.be/zGeVcP-XO7I ) and the CAD model is nice to look at in FreeCAD ;-)
Oh, and i used the great Thing https://www.thingiverse.com/thing:16187 , the GT2 Pu