Make sure you are using BOSL - http://openscad.org/libraries.html http://openscad.org/libraries.html Also all of your base points should be variables and your

Make sure you are using BOSL - http://openscad.org/libraries.html http://openscad.org/libraries.html Also all of your base points should be variables and your placements operations on those variables. Anything that is dynamically sized should also be built from variables. I usually use a single function per distinct piece of geometry, then use composition. The geometry is the effect, not the cause.