Here it is all closed up and ready to 'roll' in my kitchen:
http://www.buildyourown.org.uk/piccies/robox1.jpg
Two small (clear plastic) compartmenets open in the top on each side, and a luggage-style handle flips up from the top, to pull it on its wheels (round the back). The black bar across the center can be used for carrying it rather than 'wheeling' it:
http://www.buildyourown.org.uk/piccies/robox2.jpg
The top can be opened (via one catch) to reveal a small storage bin:
http://www.buildyourown.org.uk/piccies/robox3.jpg
Via two more catches (front and back) the top can be completly removed to reveal the larger storage bin. This has a rubber seal around the top and suggests that it *might* be able to be used as a bucket if necessary. All the standard retail Autoglym bottles (including the sprayers) fit in there with no problems:
http://www.buildyourown.org.uk/piccies/robox4.jpg
Haven't got the PC in there though, as if I did that I'd need to get the power transformer in there too. At only £18, I'd probably buy another one for the PC and some other, less- frequently used bits and bobs.
Edit: The bottom bin would fit bottles up to around 12 inches high.