With the piping I was just thinking for the two long arms that connect the larger actuators, just as an option to avoid tall prints for those with smaller printers. I used metal pipe, and 3d printed ends/brackets/attachments when i made a MPCNC, which seemed to work quite well as a system. The thought of doing the actuator shells from a piece of pipe is enough to bring me out in a cold sweat!
I definitely agree about supporting the use of metric screws, as they are easier to get hold of outside of US/UK. I have used parameters for the screw holes sizes so that changing the screw size should just be a quick and easy change of parameter value.
Eagle files are up on my github fork, on a branch
Don’t print them yet they are not complete! All feedback and constructive criticism welcome, they are work in progress. There is still quite a bit to add so i’ll put them on a dev branch until they’ve been printed and verified as correct and working.
Edited to add github link