Customized version of http://www.thingiverse.com/thing:26596

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=26596

Using the following options:

box_z = 50
box_y = 250
box_x = 400
struts_number_z = 7
struts_number_y = 15
struts_number_x = 25
sides_angle = 45
struts_width = 3
pad_heigth = 0.5
pad_radius = 10
frame = 10
thickness = 4
bottom_angle = 45