Where to buy a suitable controller

6 FET aluminium case from Aliexpress

12 FET New Generation aluminium case from Aliexpress (now potted based on a review but see [1])

6 FET battery case integrated as NCM spare part

12 FET aluminium case

6 FET Hailong-case

Sometimes cheap offers, search for the "F" :-)

Self made EBiCS compatible controller of arozhkov2001:
Discussion @ES
BOM + Gerber