An additional bonus for those who decided to build will be ordinary pallets, or rather what can be made of them. Ideas are not limited to knocking together shelves and assembling garden furniture, but how large the project will be depends only on the amount of source material. If desired, the idea can be repeated or improved, especially considering that all sizes can be easily adjusted to the desired parameters.

The first stage is the selection of pallets and their disassembly "by the bones". You can also use cladding boards from containers and large wooden boxes for the project.
Each plank is cleaned and leveled. If necessary, the top layer is removed from it, roughness and irregularities are removed. It is from them that wooden panels will be assembled, which will undergo further processing.
The assembly is most conveniently carried out on beams. Aligning the boards so as to get a shield corresponding in height to the future shelf, and in the width of one of the walls, we glue each joint well with furniture glue.
We tighten the finished canvas with clamps and leave it alone until it dries completely. Similarly, we collect the second wall, several shelves for the shelves and doors.

We additionally grind the surface of the dried boards, at the same time removing excess paint from it.

On the details of the walls, we apply the markings for the shelves.

We make cutting of square blanks intended for shelves. Having fastened a nail in the corner, we tie a thread to it in order to draw a part of the circle. If desired, such markings can not be applied to all workpieces. In this case, you will have to process them in several pieces at once. With the right equipment, this will speed up the manufacturing process.

After all the shelves are cut out, we additionally grind the edges.

We glue the shelves to one of the walls.

Additionally, we shoot thin nails at the joints.

We combine the second wall with the assembled fragment. We grease with glue the ends of the shelves and the counterparts indicated by the markings.

Finally, we assemble the frame and let it dry.
Determine the middle of the shelf by making measurements diagonally from one corner to another.

We supplement the future closed section with a transverse board. For better fixation, we use nails.

From below we attach the legs cut from a piece of timber.
On the sides, we make markings for the hinges for fastening the doors, and then select the excess wood.

We fasten the doors, supplement them with fasteners for fixing and handles, if necessary, make adjustments.

We cover the finished shelf with varnish. If desired, it can be additionally painted in any color. Then it remains only to install it in place and fill it.

More details regarding the manufacture of a corner shelf from pallets in the video below: