I noted that I've not published a project schedule yet, so here it is:
1. Planning, until end of June
2. Development phase, until the beginning of August
With the beginning of July my current (university) term ends and so I'll be able to concentrate on reaching my goals by producing the code. With the end of this phase the project shall be mostly completed.
3. Fine tuning & bug fixing, until end of August
The remaining time will be used to hunt maybe occuring bugs and to do some further small improvements and fine tuning.
I'll also write some end-user documentation in this phase, so that's easy to use the module.
Of course, it would be fine, if i'm able to start earlier with phase 3, as I'm planning to take some days off in August (holidays..).