I wish if BM can create another series based on BMPCC 6k Pro. they should put 6k pro sensor with internal ND filters into a mini boxed shape body. that will solve some of the issues people get with BMPCC DSLR style body.
I 100% agree. It would be great to have a box/cube camera from Blackmagic with ND and the 6K sensor. I'd buy one. I'm not sure if they will ever do it, though. The BMPCC's usp has always been the idea of having everything you need to start shooting straight out of the box. Even their Ursa's have followed this design principle with the flip-out screen. Maybe one day.
Hello! Just watched a video that addresses your ND stacking question. Based on a flange distance test the ND's are in fact stacked one in front of the other. The 2 stop Nd is the furthest forward, switching to four stops raises the two stop filter and adds a 4 stop filter, and switching to 6 stops uses both of the filters.