simple task to change thickness of a 3D model

Hi!

I need a redesigned 3D model of the following Samsung Galaxy S3 case:

http://www.thingiverse.com/thing:35872

The wall thickness should be 1.5 mm with no holes on left and right sides of the case.

Please PM your fee quotes and timing.

The result should be provided as an .STL file.

Thanks,

arrowroot