I've got to say if everyone OpenSCAD coded like this on their first run the world would be pretty awesome. The code is super clear and the customizer version looks like it works great. Apologies that some of the links are down - if you ever see any please let me know and I will try to fix. Unfortunately, many of the hard core makers that predominantly used OpenSCAD abandoned thingiverse with the license fiasco - those that were the most irate took down their designs - which might be the problem with the links. Now everything is scattered all over the place, which has resulted in a big mess.