Shelf extension kit

This is extension kit, which can be used to modify plastic shelfs from hardware store with help of standard waste water pipes of 40mm diameter.
Once I have find out that I need some shelfs above my working table. With my tight budget I need some cheap decision, which could be fast disasembled. I have to redesign the construction for my needs.
My working table was pretty wide in depth, so I could just put the shelfs on it.
First, I didn't want to have the lower shelf on the level of my table, because I can use table surface to store things on lower level and I could use it to store some my things higher.
Second, I wanted to make two higher shelfs wider to store more things above the working surface of my table.
I have designed additional support for this two shelfs (pic. 2) with help of waste water pipes. The nice thing of this pipes, they can be connected with vertical supports of the shelfs (see picture 7). This makes the construction stable. But check it before bying, this shel