Because of the narrowness of the area, there is only room for the screening plant. And I would keep the edges straight - curved edging is cottagey, and would look totally our of place here. Your house is not a cottage. I don't like the suggestion of trees with trunks visible. It is a colourbond fence at the look of it. I hide these - there's nothing special about them I'm sorry. And views are in the eye of the beholder. If it isn't on par with the best view that you've ever seen, then make your own view within your garden. You'll be far happier in the long run. And if you have plants of varying height so that the bottom corner is shorter in order to show the rooftops of neighbouring houses as a 'view', then the design within the garden will be spoilt. I know that there are those who think that lily pillies are common, but a plant that grows well in its position is far better than struggling to grow some uncommon plant that is a failure to thrive. I would aim for a lily pilly that is at least 3 metres tall. Consider Acmena 'Sublime' which doesn't get psyllid and doesn't need to be hedged if you don't want to. And I would run this plant the full length and around from the corner along the bottom fenceline. Your plants also would do better if the garden beds were 1.5 metres wide with the plant placed in the middle of the bed. Plants don't do well in narrow beds unless managed by a professional who knows what they are doing. As for the dwarf magnolias - these plants are dwarves of the Magnolia grandiflora which can get to 100 feet tall in maturity. So as a dwarf form, they still get up to 50 feet tall when they mature. The labels don't give a precise indication of height at maturity and are deceiving to novices. So don't go there is my advice. They also have bad root systems for so close to the house. You would also never be able to keep your lawn alive as they plants grow as they are water guzzlers as they get bigger. Nobody considers how plants behave once they are planted, but the care varies enormously with different plants.

We went with Monument and I am delighted. I was worried about it making the house hotter, but not at all as we added some extra insulation while the roof was lifted. We look over our roof to Mt Dandenong and it really feels like we are floating above the rooftops now (previously had a lighter color). I have also noticed there is far less glare being darker. Pic below is not my best shots ... but you get the idea. Forgot to add we also have a flat cliplock roof and used a combination of Monument and Dune on the house.

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we do as much of the demolition as possible including collecting all the rubbish and doing the tip runs so that workers arrive to a nice clean worksite, we usually sell or give away surplus goods on Gumtree (anyone want some old Velux roof windows?) and we found that careful salvage of old wiring and other scrap metal helps offset dumping costs BUT all this work takes time away from earning a living and looking after home and family so you have to weigh up the cost in time and money against the builders' demolition charges but i have to say some of our intentions have been disappointing as after carefully salvaging six 8mx 200mm x 50mm beams from our last reno our builder told us that they couldn't be reused in the new work without being chemically treated but, despite all the hard work we think demolition is fun and ripping out old plasterboard and tiles and concrete etc (after the asbestos removal has been done by professionals) is really great fun and dismantling buildings is a great way to help understand how they fit together