A built in desk! This seems like a good idea! This sort of desk could also be built in an extra closet (ah the luxury)?
Have you ever changed the functionality of a closet? What to?
Are you a DIY type of person or do you have things professional done?
Do it yourself projects can be fun! It’s tempting to step away from your books and your desk and build something. Ideally test your skills on something small or mobile. If your DIY yourself project is not at the scale of this desk and and part of the house it must be done to professional standards. No one wants to see DIY projects that are amateurishly done. While you’re seeing your best effort, potential buyers will see a substandard result. These renovations which you think increase the value of your home could actually devalue your home and make it harder to sell.