Hi ehwee.
Thinking of:

1. Building a built-in window bench with lifted trunk storage. Who do I engage for this? Since its specific, I can get a closet carpenter? And what are the best/recommended materials for the wood frames, considering I will be seating on it. And anything else I need to consider? Planning on to make it 300cm length, what's the recommended height and depth of a window bench for seating as well?

2. My kitchen cabinet is currently using 3G kitchen cabinet, and I'm thinking of changing the doors to 4G/other materials because I kinda of hate looking at the aluminium frames. I like the glossy finish. Possible to just change the doors in the kitchen? Should I consider 4G/5G or acrylic? Or any other recommended materials?