Large Delta With CNC Modular Frame

This is the design of a delta printer I made in 2015 when I had still access to Solidworks.
I routed the upper and lower box elements and keys on a friends CNC table out of flooring boards and similar easy to cut pressed fiber/particle boards. By subdivision of the frame I achieved that there are only 4 distinct frame element types, that are keyed together and overlap in such a way that the frame becomes quiet stable. This implementation uses solid 12mm shafts of 1m length. The shafts are on 8