Step 1: The Design
The original design I'd seen had each shelf supporting the next by using the flange bases (http://goo.gl/9HOiY). The only problem with this was that I'd need to do a lot of pole cutting and the height between the shelves would be forever fixed. If I changed the design so that the poles were at the edges of the shelves rather then between them, I could keep the poles as one long length and use the side mounting clamps (http://goo.gl/UcFBh) at whatever height the shelves needed to be. I also saw that double clamps were available (http://goo.gl/2DZVE), so by rejigging the design I could make one long shelving unit rather than three separate ones and share the mountings and pole between them.
Step 2: Getting Wood
Step 3: Making the Outer Units
(Apologies for the lack of pictures for this next step but I will try and explain as best I can how I then fitted everything together.)
The poles were laid down on the floor and then the side mounting brackets slid along each of the poles so that they could be positioned and tightened in the right place (single brackets for where there would only be a single shelf and double for where they would also support the middle shelves). The bottom and top shelves were then drilled and bolted (using coach bolts and penny washers) to two of the poles that would support them (the ones which would be the back pair). By doing this, I knew that the poles would be flush to the shelves. The whole thing was then flipped over so that the front pair of poles could then be fitted in the same way. The rest of the shelves could then be fitted, again without having to support any of the weight as everything was resting on the floor. The base flanges were fitted to the poles and the unit then stood upright. The whole process was then repeated for the second outer unit.
Step 4: Fixing Together
Step 5: Voila!
Thank you for reading my Instructable. If you liked it, I'd be most grateful if you could vote for it in the Design Competition: https://www.instructables.com/contest/design2012/?show=ENTRIES - Thank you :)