As someone who embarked on a DIY NMC battery before encountering this forum, and having access to 2nd life BEV/PHEV packs at a cost notably lower than the public, I would rather have gone with DIY LFP. I would have been done a long time ago. I'm still at it.
I would never consider Tesla modules as NCA is the most dangerous and most poorly configured option. 6S or 12S - both make suboptimal 24 or 48V systems.