OK, so we decided to build a rack for a medium sized Ball Pythons out of Aluminum and PCV!
Here is a video of the whole building process:
The whole shelf cost around 200 - 250$ (aluminum pipes + 6mm PCV sheets + connectors + wheels + heating, cables & thermostat).
And one quick picture of a whole shelf:
[img=http://www.gpreptiles.com/foto/sprzet/alurack.jpg]
Hope you like it.