Thank you for your replies and hints.
Regarding the TV, you are fooled by the picture because the angle of the upper end line of the cab itself is 7° and painted black and the TV has an angle of only about 2° (is like an optical illusion).
Further more, perhaps the perspective adds another "feeled" odd angle.
But I will think of that.
For testing I played Indiana Jones, Haunted House, Cirqus Voltaire, Medieval Madness, Theatre of Magic and FunHouse.
And I have to say, it plays fabulous.

Even better than what I have expected.
Finally my decision was to use leaf/blade switches for the flipper buttons connected via PS/2 to the PC.
I have to say, thus you can react very very quick!
(The other buttons of the cab (select, coins, ...) are micro switches)
Before owning the cab, I connected my Wii remote to my PC and played the pinballs with that - in this way I could nudge by shaking the remotes, too.
I can recommend this if not owning a cab.
But I think there is little lag because of usb and bluetooth compared to leaf switches (below 20ms). If you have no comparison you wont notice that.
Do you think, it is necessary to use fans though the cab is completely open on the lower side?
cu
seeker
Edited by seeker, 18 January 2010 - 05:00 PM.