Thank you all for your comments....(i feel a bit embarassed to be honest)
Regarding the tracks , there are some debris underneath (thats the reason they are a bit ''wavy'') but they cannot be seen in the picture !!! i ll look more into it though...
another thing that cannot be seen in the pictures is the range of colours on the tank which is more than you see (but my photograph skills and my camera are a bit crapy at the moment)
Mr Mig: your work was the inspiration for this, and both dio and the tank were finished with lots of MIG pigments (and other techniques mentioned in FAQ)
Mr Rae : if you like it so much there are more coming.....now