Ability to explode imported svg files

I would like the ability to shatter and carve select parts of my svg imported file, but cannot figure out a good way to do so. I wanted to implement the dogbone app with some large panels for a tetris style bookcase I am making. I can trim the sides to the appropriate width, so I just need to carve the ends. However, I cannot export a svg from 123d autocad without having an enclosed shape, hence the need to explode and delete sections while maintaining scale. Please help. Thanks.A
bookcase shapes indv.skp (367.4 KB)A.nc (246.8 KB)