I'll be honest here and say that I've never had anything to do with Zoysia as it's not really suited to South Australia's climate, but best suited to Queensland where you are. As far as Cylinder or rotary is concerned you can try it with a cylinder cut machine on your fathers lawn and if suitable then I think you'll have your answer. SA couch will definitely be no good on the southern side of the dwelling as it requires around 5 to 6 hours of sun on it constantly and that it won't get due to the way your house is situated on the block.
Now as far as your rail repair is situated the best method from where I sit is the gusset repair method and you must tie the original mounting nuts into the inserted gusset. This then stops more of the same happening.
Cheers, BB.
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.
