Hi, I like the overall concept of the darkish grey, it suits the home. I am a colour consultant and have been working with the Dulux range for 17 years and you are on the right track with the Guild Grey. The Dulux Signature will give you a dark blue house. Another option if Simone Weil which is just a bit lighter than the Guild Grey, if you find that one too dark. Sample pots and A4 brush outs onto white cardboard are the best way to decide, because computer programs give an overall impression of the "look" but are not accurate with colour choices, you can't beat the human eye. All the best, it's going to look great.

Congratulations Aaron on finding your "Forever home" & wanting to preserve it's 70's vibe. It does look like a big project to get your teeth into! I would think the black to be a bit strong & tend towards a warmer tone with the brick. Sandstone is also a light stone with yellows, apricots & warm tones. Woodland Grey from the Colorbond range has olive/brown tones which might suit. It depends on the vision you are trying to achieve but it looks like a natural modern style would suit the theme of the house. By that I mean taking cues from nature for colours. Good luck!

Oh my husband can do this for me so its no issue, but I wouldn't be asking him for design advice (what would look better). while he's great with his hands he's The first to say he has no idea about design. It's more from a design perspective.... Should I go black horizontal panels, a pattern, vertical etc

personally I like a home that has a similar style on the inside as the outside, it just makes sense to me. In the past I thought building extensions should be similar in style as to the original, however after reading (and commenting on) Houzz posts I am now coming round to the idea of a modern extension on an older building. But having a kitchen and bathroom in different styles, that might just be to your taste and that is fine - there is nothing wrong with a building reflecting the personality of the owner!