Nice graphic. Thats a big plate. 350mm = 247mm max square build ( is that right?) Nice. So for the calculator, cant tell if you are joking, but here is the link to the youtube -> https://www.youtube.com/watch?v=uDB4hE6nyYI&t=575s and his openscad visual calculator link -> https://github.com/Jaydmdigital/mk_visual_calc

Seems useful.

was going to ask a question, but I just forgot. Memory is the second thing to go....................