Minecraft structure planner to OpenSCAD Ruby converter

I've been working on this Ruby script on and off for a while now, but never felt it was ready for distribution. Then http://minecraftprint.com/ came along, and made me push an early version out. While I see the benefit of being able to search through an entire world and pick out the structure to print, it's not really an option for larger worlds, and the selection method seemed cumbersome.

My idea is to use an established file format as the base for conversion - http://www.minecraftwiki.net/w