Nice project. I think this is one for the blog. :D
Thanks a lot :-) I saw the entry!
In the meantime I tried to drill the wholes a bit bigger. This wasn't any problem at all.
I could install the LCD quiet nicely into the case. Thanks for your advice!
Now I face the challenge to install pushbuttons, battery etc.
The first solution using a protoshield with mini-breadboard hasn't worked out unfortunately. The buttons are too high as already documented in another forum entry.
Now, I plan to solder the connections directly onto the protoshield and leaving the breadboard.
Unfortunately I'm short on time, so this will take a while...