Barra... dont give up... get yourself 4 x 100AH cells in Oz, have a practice with them. Then plan your system and go for it. And get the Clean Power BMS - they are reasonably priced and good to practice with.
Don't give up.. the LFP naysayers are the equivalent of the flat earthers.. they are afraid of the unknown.
Ask ebaugh (Bob) for advice and help as you go along and look at the other forum and ask T1 Terry for advice (he is somewhere in NSW).
Feel free to PM or email
me - I can pass on what I have done, but for sure, I am no expert....
FLA/AGM make no sense - LFP simply require a different mindset, there is nothing to fear.