For those still looking - Scion has a good mix of Scandi wallpapers https://www.wallpaperstudio.com.au/brand/scion

I adore both Interia and Lo and Co Interiors for hardware. They aren't cheap but I wouldn't say they are super expensive. If you use some of their statement hardware, you could just do them on lower cabinetry and leave the upper cabinetry as push-to-touch and keep it simple and a bit cheaper.

Generally, I find it commonplace that approximately 10% of your properties value is a maximum figure to not over capitalize, however above and beyond that doesnt factor in personal choices, like upgrading to a specific stone or appliance to suit your needs or wants. These things I would weigh up depending on how long you plan to live with the kitchen, and if it will be a long term ownership or short term with potential to sell with profit. You can easily send off a benchtop plan to any benchtop fabricator or even a st e mason and ask them to quote, just include walls, and indicate exposed edges of the bench so they include a polish cost, and any cut outs indicating your ski or hotplate etc. Where possible, note your stone colour choice for accurate costing, and then ask your cabinet maker to quote Benchtops separately, this way you have disclosed the biggest cost and decide to get it where it works for you.

check local cabinets makers or companies like LA Wardrobes