I agree with Luke there , some wood can break up large white areas to good effect. We are building a small houseboat too and white will be the dominant back drop to keep things light and airy . Our wooden vanity top in the bathroom ( recycled Tasmanian Oak flooring ) is what we used. The seating was treated in a similar manner. A work in progress. This will be similar to our kitchen area.

You're right, they do look amazing . I'm not sure why my husband didn't want to re-use them, I think he wanted a more modern look, and now they have been sold, so not an option, unfortunately. Thanks for your comment though. I'll show him these lovely pictures, cheers.

Thank-you, that looks good!

I don't think you need to worry too much about matching metals and I think black is incredibly versatile in that it can look both modern and classic. It's more things like sidelight profile which date doors. I'd try and go for glass in your sliding door as that already exists.  Here is a glass cavity slider I have which I have either side of a double sided fireplace to close off a living space. So versatile. But probably more modern than look you are going for.