cr-10 frame stiffener attachment

Simple addons for stiffening the frame. this pieces will allow to triangulate the frame using some bolts and a M8 threaded rod.

the objective is had in mind was:
1) As little machine modification as possible
2) As simple and slim as possible

there are 2 types of addons:

The ones that get bolted to the 2020 frame, use tnuts, (considered for me the best and final design), they work with a couple of nuts , one trapped and one out of the piece ( see image) there is one for upper side and