The Nightblood_Segmented_Template.stl has the support rods in place so you can adjust length and diameter before recutting with the boolean tool if you want different sized support rods or pins.
.25" threaded rods are commonly available and you can use either filament or bailing wire for the alignment pins.
Segments are cut to be printable on a 235mm tall bed.
The author remixed this model.
I added a .25 inch cut out for a support rod down the center and 1.8 mm alignment pins on either side of the support rod.