> It is important in the longrun to have more and more of such builders for standard components used in packages. Thus you can make development easier on the one hand but also enforce a consistent look and feel for the whole site.

Builders are mainly includable templates, so making more includable components is a parallel goal.

Also on builder styles, it is probably good that the styles are defined for each builder, but they should be set at whatever level is appropirate. Probably default should be to set the styles at the subsite level.

It looks like a good plan.