Need Comment on How my House Was converted from 120vac to 240vac
You should change the light switches to double pole switches that cut both halves of the power supply. These are commonly available (how hard they are to get where you are, I don't know.)

The breaker handles for each pair of circuits (that are now "one") should be "tied" if the breakers are not themselves double breakers (which is what I think you've described) - preferably they would all be replaced with double-pole breakers which do not need a tie. While you don't have local codes/inspections, this would be safest for you. This requires the pair of breakers to be located side-by side, not opposite as you have drawn.

You should also change the outlets (evidently still US-120VAC style) to the local common/standard 240VAC style, if only to prevent mishaps with 120VAC equipment being plugged in.