The file contains one side shelf (you’ll need to duplicate it and cut the opposite side) and the lower and back braces.
For this project I experimented by choosing to not build my corner circles into my SVG file, and created them on the fly using the Design tool in SO. It took a little longer, but it was fun. You can choose to add them if you want.
I ended up using a -0.01 offset to get a snug (but not super tight) fit.