EngineerBC

1) Why I said move your 63A up, your change-over switch must feed from the bottom of a protection device (CB)
2) What Keith says in the video, to my understanding, your two single phase, paralleled inverters must feed from one (1) protection device, not two (2).
 So you must only have ONE suitably sized circuit-breaker for Grid In and the same for Load out.
I will try to upload a schematic the way I understand it.

Hi @VirWat thanks for the reply. 
1) I like the suggestion about moving the main grid MCB but then, as I understand it, if I switch over to grid side (on switch over MCB), and I want to remove grid from the two inverters I need to isolate them individually (one by one).  If you say the breaker 'must' be moved, is this a regulation or guideline somewhere?
2) The reason I have those parallel breakers (main grid in and main load out) is because of a video of Keith of Sunsynk about paralleling inverters. He said that Grid, Load and Battery should always be switched together.  Not sure I misunderstood what he said.