[O] How to collect status of all checkboxes in lower subtrees

[Rainer Stengele]

Hi!

I have a headline with several sub headlines and sub items in lists.
Scattered all over I have checkboxes.
I would very much like to collect and see the overall status of unchecked 
checkboxes.


Example:

* project
** subproject 1
- [ ] todo 1
- [X] todo 2
- [ ] todo 3
*** sub subproject 1
- [ ] todo 1
- [ ] todo 2
- [X] todo 3
...


I would like to see

* project [2/6] ...


Is there a way to achieve this?
I already know about  org-hierarchical-todo-statistics and  
org-hierarchical-checkbox-statistics.

Thanks,
Rainer