Good preparation makes things easier. Try to create a draft that is as detailed as possible. It is important to have a clear idea of the proportions in order to be able to specify the dimensions.
Transfer the sizes defined in the drawing to a material plan and plan the waste.
For this project you need boards that must have the same depth. to accommodate small books in the shelf, I choose a depth of 160 mm.
When cutting the wood, make sure that the results are accurate. This makes it easier to join the boards and you don't have to do a lot of re-sizing.
Now you can cut all the boards that are needed.
Lay the boards together on a table and check that the individual lengths fit together exactly. If it doesn't fit, you can still tweak it by trimming it again.
To place the joints in the right place, mark the places where you need to connect the boards.
Connect the boards together. Flat dowels are useful here, as they provide additional stability.
Add a chamfer to the back boards so that the backs cannot be seen to be browned. A table router is ideal for this job.
Sand the surfaces and edges until you get a good result. Of course, this depends on the type of wood and the texture. You will know when it is right:)
Glue the base elements together. Use clamps to fix the workpiece. Since these parts are connected with right angles, it is ideal to connect this first.
Now test the fit of the boards, which are attached to the base form with a 5 degree angle.
If you are happy with the shape, glue it together.
To achieve additional stability, the load-bearing boards can be additionally screwed. The screw heads can be covered again with wood for a better look.
Now everything should be in place and the basic shape is visible.
Make the back panels. The exact sizes can be measured on the workpiece.
Now everything has to be thoroughly sanded again. Then you can start oiling the surfaces. Repeat the process as necessary until you get the expected result.
To set color highlights, you can use the back panels of the workpiece.
Paint the back panels. Then attach them to the base of the shelf.