Asphalt/bitumen could get sticky in summer. Not a fan of the smell either...... An Australian Sandstone paver would look pretty classy. Not cheap but everyone else has concrete.......because it's cheaper........ Although once you add stamped, oxides, patterns, etc. to concrete the more expensive alternatives aren't so dear after all.

Probably not a bad choice actually. We'll be seeing a lot more of these permeable driveways in the not to distant future as they reduce rainwater run off from our sites into our gutters. Use a combination of both concrete and permeable perhaps. Such as where you park the bike on its stand or do bike maintenance use concrete. There are other permeable pavers available as well as these ones, council's use them a lot around parklands, trees in footpaths.

You've got a good space and good ideas. My suggestion would be to decide on all the structural changes first. It is tempting to go for small wins first. But you'll never regret doing a master plan. Set out everything you want to do. It's OK to have lots of stages and even a few dream things.

It always makes my heart sink when a client asks for a "no-maintenance" garden. It tells me they really don't care. In truth, any planting needs a certain amount of care. Plants, like animals, need care. It's true that they're slower than animals to respond to deprivation, but respond they do. And it's not a good look. You might not have a lot of time, or you may not be physically up to a lot of gardening. That's fine - you can choose plants that require a minimum of care and grooming, and if need be hire somebody to do that minimum. But it does require planning. A gardener actively engaged with their garden can (and will!) experiment, try new things, move plants around, notice when things are going right and wrong, and for them a garden is never finished. Contrast that with somebody who wants a garden they don't want to work in or at. They want a garden that is more or less "finished" the day it is installed, rolled out like a stretch of lawn and meant to "behave", to stay static. I can't do a garden like that! Plants grow! They change, the environment around them can change, and what might have succeeded one year is not going to do it the next. It is entirely usual for a planting that just nicely fits a situation to need complete re-planting a few years on because the individual plants have outgrown the site. That's work! It is entirely usual for plants to flower, and for those flowers to set seed and die off. It is entirely usual for some plants to shed leaves as part of their yearly cycle. This "mess" is treated by non-gardeners as a crisis, as a nasty surprise, as something the plants "shouldn't" do. Because it makes work. Well, sorry, but no garden consultant can change the laws of nature. If you want a garden, you've bought work, and if you don't want to do it, you're going to need to pay somebody else. That's fine. Just don't ask for what you can't have.