Yes! Why not! I'm more than "a tad" older than you and can see all the inappropriate plantings here and wish I'd not been so adamant, stubborn and even enthisiastic and passionate back then. I'd like to imagine you 20 years from now enjoying the beautiful fragrance of your plantings and not having to remember, looking at your aged, sore and tired hands, how hard was the task of taming and imprisoning the devil in lilac! There comes a time when even one's passion becomes a chore...Nobody is exempt. My hands are crippled with arthritis. I cannot get a grip on my brushes, thus the hard work has deprived me of a pleasure and a passion....that is the way it is for many so I hope you are immune. Unfortunately ageing is what the body once strong and virile does and it has no mean influence on that part of a creative person's life. I will imagine you 20 yrs from now, sitting peacefully and enjoying the tenacity of your younger days...not wishing you had done anything differently!

That red brick wall is going to make a wonderful backdrop. I dont really have any design suggestions but after scrolling through some photos, one stand out was this blue and blue-green used as accent with red brick. Maybe achievable with plants or wall decor, if you like the colour.

A floor to ceiling cupboard would work well in this space. As mentioned in the above comment using Mirror on such a large surface in the bathroom could become a hassle to constantly keep clean. However if you do like to look of Mirror I do suggest a dark tinted mirror, as this would go quite nicely with the colour of your tiles and not look to harsh in the bathroom. For the doors a Pocket door system would work quite well! this is where the door is opened and then you can slide it back to be in line with the cabinetry. I would keep the colours of this cabinetry quite plain and stick to the same colour palette of the tiles. Goodluck !

Start by spending a portion of your budget on the various dream feature items that are relocatable and can be used in your final design anyway. e.g. Buy the firepit you really want - it can become the focal point of your future garden. Test it outside in your backyard for a few months. Are heaps of mozzies annoying you while you're sitting outside around the firepit? If so, then you'll know that you're going to need a gazebo with flyscreens as well as privacy curtains so you can really enjoy lying outside in your hammock year round. The hammock is another relocatable part of your design. First, lie outside in your backyard on a swag or a rug for a few hours. Is it too windy? Is there road noise? Keep experimenting until you've found the perfect location for the hammock. Then buy an inexpensive hammock and suspend it from a couple of sturdy RL4 poles. If it's working, then this is the place where you should build your future patio, that's going to shelter your hammock. Keep testing inexpensive versions of your other ideas out. Trial tea candles or a string of inexpensive white Christmas lights as garden lighting. Do they create the feel you want or do lights just attract moths or unwanted insects? What about relocatable solar garden lights? Or a portable floodlight from Bunnings? Where's the ideal place for your garden table and chairs? Test it out with inexpensive camping chairs - or chairs you already own for a few months to be sure. Then invest in the perfect outdoor table and chairs. Same with the water feature. Start with a wine barrel with a waterlily or a second hand pond off Gumtree. Can you hear the trickling water in the garden or do other noises crowd it out? Keep in mind big goldfish need deep water and space to swim. To help you in your choice of plants,look around your immediate neighbourhood. What purple, blue and scented plants are thriving in your immediate area? Who has the best garden in your street in your opinion - and why do you think that? Do you always see a particular neighbour passionately working outside in their garden? That's the person you should strike up a conversation with to get advise about suitable plants for your immediate area. Chances are they will not only give you heaps of free advise but they will probably give you plants and cuttings as well. Markets are another source of perennial plants that grow well in the local area. Plant these smaller plants into large plastic pots and garden bags and allow them to grow for a year or so. Consider herbs as filler plants - many are highly scented, can be used in cooking and often have interesting foliage e.g. choc mint, fennel, rosemary etc. After you've been using your backyard for at least a year and you've experienced all of the seasons, then invest in your big ticket items like your gazebo. Buy or build a structure that's truly practical for your local microclimate - incorporate glass, windbreak fencing, shadecloth, mozzie mesh or whatever you need to make your hammock shelter ultra comfortable. Build this structure where you've tested it and know it will work - not where a stranger who designs gardens thinks it should go. Spend the remaining money on the things you know you need and want - the stones, plants, irrigation, a birdbath, etc