This is a picture on the correct exposure.

Olivier, yes the tracks really are far too loose. I'll have to cut a bit off and sew it or staple it as you say. Thankfully on this kit half the top track can be missing as it cant be seen. :-)
As for the pre-shading, this is the first time I've used Xtracrylix paints from Hannants. It seems to go on either very watery or totally obliterates the pre-shading 'cos it's too thick. I'll have to work on the mix. It constantly blocks my airbrush tip too.
I think I'll go back to using Tamiya acrylics, had absolutly no problems with that stuff. Great paint!
Can anybody please tell me why the pics are so small, is it something I'm doing wrong in the selection?