Firewood shelves

After the building the tiles wall at the parking space in front of my house, I have made the firewood shelves for the stock of  firewood which will be used from this Winter. This shelves are designed as the container system,  900 width by 400 depth by 900 & 600 hights. So, they are combinated  three types of hights, 600, 900 and 1500.

 These shelves are able to tie each holizontally and vertically by the steel wire in order to keep staibility for some eathquakes. I have already made 2 sets of 1500 hight unit. Then I must continue to make several units for the stock of one year portion including spliting firewood. That's the very hard work, is'nt that? I need some help. Is there anyone who wants to do this?