It is highly unlikely that you will have to acquire a building permit for this type of project, unless you decide to do any kind of plumbing or electrical wiring. When in doubt, be sure to check your city's building codes.
If you are looking for a sliding door wardrobe, make sure you match interior segments to the number of sliding doors. For example if you have 4 doors then you should 3 segments to ensure easy opening.
The corner shelf can also be a great place for a small television. You don't want to put a lot of weight on them, but a depending how it was mounted to the wall, some can handle up to 50 pounds. Screwing them directly onto the studs can dramatically increase the amount of weight they can bear. So be sure to follow all the manufacturers recommendations and limitations to avoid a disastrous situation.
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