Since we know neither the dimensions of the shelf that you will choose to build nor the thickness of the material you will use, the woodworking joints (e.g. tabs and slots) have not been drawn on the patterns. On our site, there are several other similar projects of scroll saw shelves, which you can see on the following pages: 92 scroll saw shelf bracket patterns, Scroll saw corner shelf project, Scroll saw wall shelf plan...
The brackets scroll saw patterns have been precisely drawn, and all you have to do is choose the one you like best, scale it to the desired dimensions, draw the tabs and slots and do the cutting. File formats are available with which you can print the scaled drawings, as well as file formats suitable for cutting brackets on a laser cutter.