No your roof can't support that weight, it's designed to hold the weight of shingles only. You will need to contact a structural engineer to come up with a plan to support the additional load.

I am not sure you need to add a deck or raised paving, when there is a usable surface there already. You will have gained a closer connection to the living area, but you will be more exposed, both to neighbours and to the wind, for a significant cost. Raising the fence may break height restrictions, as mentioned, and will also really box you in visually, especially with overhead louvres. Those may feel too low over a raised area if at eave height, and if higher could look awkward against the house. The fence already shades the area alongside it, so I wouldn't extend any further shading right out to the fenceline. I would consider a shade sail before louvres, both for cost and for a lighter, less boxed in appearance. Is there access to bring in a large tree? A good sized deciduous tree positioned near the fence at the edge of the lawn may be a good way to get some attractive summer shade, autumn colour, added privacy and may be cheaper than a set of movable louvres! Below the new doors from the living area, create wide steps These could wrap around to meet the existing steps. Wide steps can become a casual seating area as well as create a connection to the existing paving, and they are less of a barrier visually than a small set of steps. They could incorporate a planter, which will help to soften an otherwise quite hard outdoor space. This would also allow the lawn to remain connected with the paved area, making it feel larger.

i changed my setting to OZ as i was told there are not a lot of kiwis here on the forum to give advice:) hopefully some wonderful aussies can help me:)

It's not showing in the Ozzie forum. You need to change your country to oz, then start a new thread, with the photos and post it. If you go to the Ozzie forum, you won't be able to find it. So what I think you have done, is just change your setting...but you need to post fresh I am afraid! So you will have two posts, one in NZ forum and one in oz...but the Ozzie peeps will only see your oz one, so don't mention posting previously Keep that between us. :)