Yes. Your ideabook shows mostly kitchens that have a shade of white. Please state your home country so that Houzzers can talk paint brands and colours with you. :) relax!

I found a website that might be quite helpful for you http://www.colourtouch.com.au/ to visualise what colours and finishes could look like on your house. You can choose a style of house that closely matches yours then choose a number of set schemes, or start with a blank canvas and play around with any colour / finish you like.

In my opinion cavity sliders will not keep the aesthetic of the home. And this is not a new build it is a renovation, so cavity sliders may not be an option. My choice for the bed to be on the wall with other bedroom robes, is because it will be more private. When people are walking down the hall they will not look directly onto someone in bed, if the door is open. When someone is entering room, there is still privacy for a person in bed, because of the swing of door.

are the new sliding glass doors double glazed? are the original windows single glazed or in need of replacing for any other reason? do you hate the beige colour? how many of the old windows can be seen at the same time as the new doors? ... inside looking out is the most important view for me but what do you like the look of?