Dear silvio,

yes, i've seen the video
unfortunately I am bad at mechanical design
and the cost of construction using a CNC machine is not cheap

this is the progreess
dummy1.jpeg
dummy2.jpeg
from this configuration we can use
A-B : 100ohm 300W
A-C or B-C : 50 Ohm 150W
A||B(parallel)-C : 25 ohm 300W

dummy3.jpeg

This dummy load works good but the heat must be radiated to air using fan or maybe dipped to motor oil