Customizable threaded scupper plugs

***UPDATE 26DEC 2015: Replaced .scad file with version 1.7 that now has several additions. GoPro connector from http://www.thingiverse.com/thing:62800 was hacked in. Top and bottom bevel options are now available. The "scoop" bottom style is experimental for future use in the water jet drive propulsion system.

***UPDATE 25 DEC 2015: Replaced .scad file with version 1.4 that now includes fishing pole holder option.

***UPDATE 24 DEC 2015: Replaced .scad file with version 1.3. Some variabl