Borg I used what factory cables I could but had to get 5 cables from a local battery store in order to run them in parallel. As for the batts, I do not have a BMS, just connected them with the cam communication wires that were included with them. I hope that's good enough and don't encounter any problems later.
GNFO yeah I couldn't use the Hisun jhook clamps either so I ended up securing each batt with straps for now, looping under the metal baseboard where the jhooks were.