here is my rig for the bmpcc 4k, this also applies to 6k 6kpro as the body is the same.

Parts used -
Tilta BMPCC 4k/6k cage with top handle https://amzn.to/3Tf37TQ
Tilta follow focus hand grip
Tilta V mount battery plate https://amzn.to/3MB4qu5
or you can try Smallrig V mount version, its cheaper https://amzn.to/3VxRgCn
Tilta V mount 12V DC power cord https://amzn.to/3g9KzWR
Tilta N Nucleus follow focus kit https://amzn.to/3S2tj36
Tilta Base plate https://amzn.to/3CtIaxu
Tilta 90degree HDMI adaptor https://amzn.to/3D06N6v
Tilta 90degree USB adaptor (this is incl. with cage set, but if you want it separately) https://amzn.to/3EKUg8u
30cm rods you can get any, here are a set of smallrig rods which are super light and durable https://amzn.to/3S3WYJ8
Hollywood M1 monitor https://amzn.to/3MvWNoR
Kase Matt box or you can try the Tilta Matt box https://amzn.to/3EKTw3c
Samsung T5 SSD https://amzn.to/3eyBExH