OK...
Here's the main reference shot:
... the shot used to build the panel:
... and the shot used to get the Marshall logo:
finally, a wireframe of the whole thing ... Front:
... back:
The object consists of 16437 polygons of which 1533 are plain old normal polys, and 14904 are subpatches. There are 19 surfaces, and the model is spread over 10 layers (although more are envisaged to allow for independant animation of controls, etc.)