Customized version of http://www.thingiverse.com/thing:155001
Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=155001
Using the following options:
enclosure_inner_width = 50
cover_thickness = 3
enclosure_inner_length = 100
enclosure_inner_depth = 25
enclosure_thickness = 2