I recently started thinking about a tool I may develop which would extract Minecraft worlds and save them as map-files, which could be edited in GTKRadiant and compiled into maps. After looking at the format minecraft stores its worlds and some map-files, i think this would not even be that hard to do. But before I start wasting time on this, I need to know if it's worth it.

Namely Im worried about Brush- and Face-count limitations. Minecraft worlds tend to be made out of a lot of blocks. Each block would be represented by at least one brush with at least 6 faces.
In this thread I read that the limit for faces is 65'535 and the limit for brushes 32'768. That thread is quite old though.

So these are my questions:
- Is this information still correct/up-to-date?
- Do hidden brushes/faces (e.g. a brush which is complete surrounded by non-transparent, solid-brushes) count towards the limit?
- Do caulked faces count towards the limit?

If someone knows a better place to ask these questions, please tell me