It's really a relatively easy project, not much work is needed, although some precision will be useful. The size of the bookshelf can vary, in my case it is 2m wide and, well, room-high (2.70m). With 8 shelves this gives me 16m of book-space. It won't be a problem to make it wider or narrower though, or changing the height. Also the shape can be changed relatively easily - you don't have to have the curved lines, just use your imagination.
- 3 boards 2700x120x18
- 2 or more MDF boards 2700x1400x18
- 3 long screws with studs
- Paint and varnish
The single downside of this design is that you won't be able to move the shelf elsewhere easily - it will be screwed to the wall. Though it's only three screws that hold it, so moving it is not impossible and will not involve demolishing your walls too much.