dual-occ on RZ2 block in Canberra

Hi guys,
Newbie here but have been following the forum a while. I’m sure this has been discussed numerous times before but I’m struggling to find a definitive answer to a couple of question. I’ve been going through act planning docos and they don’t seem to be very clear on certain aspects. Hoping to pick your brains here pls :).

The block is in RZ2 and the size is 813m2. Currently an old family home built in 1971.
RZ2 allows for “dual-occupancy” (min 700m2) and each dwelling can treated as a separate title.
I’m thinking of knocking the house down and rebuild a duplex on this property with both dwellings facing the street.The thought is to rent one and live in the other.
But also I wanna be in a position to be able to sell one off in future in case circumstances or anything changes from the current plan.

I’ve attached a link to the development code as reference.
http://www.legislation.act.gov.au/ni/2008-27/copy/116951/pdf/2008-27.pdf

1) Do I need to subdivide the block to achieve the above ?

2) I read about “dual-occ unit-titled”, does this method allow me to achieve the above without subdividing ? Would I then need some sort of ‘body corporate” since the term says unit-titled ? What is the cons of doing it this way ? or pros ?

3) The plot-ratio is indicated as 50% on ‘single dwelling blocks in RZ2 ‘(3.4,R8,Page7). However I also came across another rule (3.5,R9,Page7) which says plot ratio of 65% on RZ2 on ‘ blocks other than single dwelling blocks in RZ1, RZ2, RZ3 and RZ4’. What does this mean and how do I determine if I can achieve 65% as indicated by this rule ?

Much appreciate any response.

Cheers