The only issue with ledged and brace with traditional fittings is the draftproof element. They do tend to curl way from the stops in my experience. If you have the money id go for a framed ledge and brace or any other style you fancy made bespoke for you to suit your sizes. If sound / draft proofing is an issue you can put a seal in the door stop that the door shuts tight against cutting out all draft and noise.

Hi, here's an interesting article with some good photo examples of what goes and what doesn't go that well together. There are so many different shades of oak for example, that it's difficult to say whether in your case it will work or not. Don't overthink it though. Usually following your gut feeling is a good idea. And if possible, look at samples together. Preferably in your home. https://www.kylieminteriors.ca/how-to-mix-match-and-coordinate-wood-stains-undertones/

You are perfectly right all timbers receive the same stain differently. Rather than mixing the stains physically as liquids, have you tried applying layers of the two stains on a sample..ie this may have a differing effect. We often create a deeper / different finish / effect by layering a stain / stains. As for my engineered wood flooring recommendation against dark/ ebony I would go for a complete contrast for a contemporary look and use American White Ash see below: American White Ash - Saatchi engineered flooring above is a beautiful, durable contemporary floor. American White Ash Parquet flooring contrasts beautifully against the rich tones of our English Elm Parquet flooring below Hope this helps Charlotte Wood Flooring Engineered Ltd

There are a lot of products on the market and I’ve used Dr Oetker Pet Stain Remover with success. I did see this suggestion below online using household products. Don’t despair as a professional upholstery cleaner will probably sort that out for you if all else fails.