The Kossel was originally made with 1515 extrusions with linear HIWIN slides and has quiet a small build volume. The scaled up version uses vslot 2020 extrusions. Vslot will be ideal; no slop and smooth quiet, precise motion. It will end up looking somewhat like this minus the direct drive extruder.

I've ordered most of the parts. I still need to acquire a power supply, screws, some carbon rods for the arms and a heated printbed. Updates to come when build proceeds : )