That’s one he’ll of a Reno. I can see there would need to be extensive plans drawn up, engineers reports supplied, council codes referred to, building codes. Not to mention an exclusive use special by law.
You want to change things not only within your space but items generally considered common property ie the front door and the plumbing into/out of the unit, gas line, balcony door, floor tiles, changing window.
Do not forget that many people move into strata not just for the cost but for the added convenience of believing that a lot of the repairs/maintenance are the responsibility of the owners corporation. Making massive changes will make you and any future owners responsible for the areas you have changed. In fact looking at your list there wouldn’t be much left to be covered by the EC, as you also mentioned a subtube through the roof!