I reworked some files, created endcaps and feel like I could publish the first version of the yagi design.

The files now can be found on my github repository: https://github.com/pointhi/oe5tpo_antennas/tree/master/portable_yagi_v1

Please look onto the README.md file, because the models are specific designed for my printer, and probably need adjustances of the tolerances (otherwise the modules wouldn't hold on the rod).

This is how the new designed endcap looks like. Now a fully assembled antenna looks pretty professional: