Listen to your architect. Grey/silver looks clean and will never date. We took our architects advice and went with silver. I like the fact that they blend into the scenery and house and are not a feature you see. I do not even think we had aluminium frames mid 20th century. Wood?? Black frames I believe became popular decades later.

I suggest you ring the Feast Watson support line and ask them and let them know what type of wood it is, eg solid or veneer and what type. I had such a difficult time deciding what to use on my wood benchtops in the kitchen, the product I used is perfect. I consider aftercare a big factor and the product support person helped me decide because of the ease of maintenance re accidental scratches etc.

It is not a great job, and it looks like the installer made the top trim piece a little short, so it makes me wonder if any other corners were cut? Did the installer run any flashing under the weatherboards, or does the top trim piece continue up behind the weatherboards to act as a flashing? When you are installing a manufactured, straight, smooth piece of aluminium against a rustic, hand-made, brick wall, which is never perfectly straight there wall always be gaps. It looks like the first angled plank above the window trim may already be rotted, so it is a pity that you didn't get this replaced/repaired before the window was installed. The lump of black silicone isn't going to help any existing wood rot. If you had wanted a neater corner joint then powder coated aluminium is not the material, but timber windows do need more maintenance.

Sorry i cant help hands on but would like to offer some advise. just be cautious when planning your painting and make sure you get at least two quotes. check out your painters with past reviews and ask freinds and work colleague's for recommendations. good luck with your painting.