Customized version of http://www.thingiverse.com/thing:121479

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=121479

Using the following options:

ContentZSize = 150
ContentXSize = 124
wallThickness = 3.2
ContentYSize = 108
screwSize = 1.5
rimThickness = 1.5
tolerance = 0.5
screwHeadWidth = 3
screwHoleSize = 2
rimHeight = 3.0
screwHeadHeight = 2.6