If panels are still unsealed.......A good quality product would be dry treat (Description/application below) it can be sprayed on to the vertical surface with a good quality sprayer. Any excess should be wiped off with a damp cloth of the same product. product wont affect the existing appearance unless you leave areas of excess product. Its best to contact (Dry Treat) and be directed by your local sales representative of the correct application for this. Always best to speak to the manufacturers of any sealant product first. Guy Typical applications STAIN-PROOF Original™ is suitable for a wide variety of indoor and outdoor applications in residential and commercial buildings, including: building facades, floors, walls, countertops, showers, swimming pool surrounds, patios, garages, kitchens and entertaining areas.

Might be a bit busy with that many finishes (white render, colorbond, stone + timber screen) and your design looks very clean and simple. I do love the look of this timber style so interested to see what answers you get.

Plain ceiling white is a good choice for ceilings. I'm a huge Natural White fan but will consider Whisper White next time I'm painting.

Depending on your budget I’d paint the cabinetry, replacing the doors if you can afford to and just painting them if the budget is tight. Just a thought, maybe it’s possible to fill that detailing in the doors to make them appear flat once painted. Not sure if it’s possible. It’d be a shit of a job but then you’d have solid wooden doors. And new handles. The same with the tiles. Paint is a cheaper option. New tiles would give a better finish. Remove the window valance. Perhaps resurface the benchtop with a product like rustoleum. Replacing the oyster light with something more contemporary. Open shelving can look great and lighten a space but think about whether this compromises your storage capacity. Everything will be on show. I think if you paint the cabinets then the floor won’t look so bad as there will be separation between the similarly coloured floor and ceiling. Cork is great in kitchens as it’s soft so it’s easy on your legs and back and forgiving if you drop things. It’s also making a comeback, as are timber ceilings. I would choose soft flooring for a kitchen over hard flooring. Kitchen floor tiles are a pet hate of mine. In my next build we’re putting rubber or cork in the kitchen. You’d struggle to put a double oven next to the fridge as it’s a thoroughfare. You’d also lose your pantry. Is two side by side 60cm ovens a possibility where your oven currently is?