House bank upgrade verification

[SailtheWind]

Call for verification
I have searched CF for answers but I have not been able to discover the one that I need. It seems like the threads I found only discuss even numbers of 6 or 12 v batteries, since my space only allow for the equivalent of three 12 v I want to make sure I end up with 12 v not 18v.
My house bank currently has four 6v batteries (Trojan T125) connected in serial and parallel giving me 12V and 480AH of capacity. I would like to increase my capacity to 720 AH. This require a total of six 6v @ 240AH each wired in parallel and serial. I want to confirm that the drawing below will provide me with the desired outcome: 12 v at 720Ah
Yes all the batteries will be new and there is a separate 12v starter battery for the engine.

Battery A positive to load
Battery A positive to Battery B positive
Battery B positive to Battery C positive
Battery D positive to Battery A negative
Battery E positive to Battery B negative
Battery F positive to Battery C negative
Battery D negative to Battery E negative
Battery E negative to Battery F negative
Battery F negative to ground

Drawing.pdf