Info boxes
From User talk:Dalek
You asked about info boxes. Since then I think I've near enough finished the navigation template thing. Take a look at {{Navsidebar/sandbox}}. This would act as a half decent base for what you want, it would keep it in line with the other templates, although perhaps infoboxes can be wider. If you look at {{Navsidebar/testcases}} you should be able to see how it goes together.