@theCoder: I'm thinking of putting a small bolt on each corner. There will be no t-molding on the CP, so no friction there.
Ok, time for a little update.
I've been busy with wiring the cardboard CP to look if it's all working. Well, it is working! I planned on wiring the whole CP, but I decided otherwise. So, one side of the CP was wired. The joystick was connected to the J1 inputs. I connected 3 buttons, instead of 6 and only the one player button was set to active.
The first time not all the buttons and the one player button were wired correctly. When that was corrected, I was in for a test round. Because I didn't wire a coin button and some admin buttons, I had to connect my keyboard now and then to be able to select a game and put in some credits. It was just a test, so it didn't bother.
The test brought to light that playing ms. pacman with an 8-way stick is... well, ---smurfy--- as hell! I really have to think about this, because I want to be able to play SFII also, but ms. pacman too! Also, I want to be able to play SFII in 2 player mode, so one 8-way and one 4-way isn't an option.
I'm actually thinking in maybe building a joystick myself. I think it shouldn't be that hard, but maybe there are here some people with an opinion about that.
2 weeks ago I bought a big monitor for the cabinet too! It's a 22" IIyama. I'm planning on making a frame and decasing it, so it can be connected to the cabinet.
Ok, some pictures...
Before the wiring...

It's a test, so i didn't bother myself with any soldering...

All ground wires put together...

I did bother myself with crimping some wires to the quickdisconnects...

The wires were put in a euro style terminalblock...

The keywiz with the self made connector was connected to the other end of the terminalblock...

Even when it wasn't hooked up to the computer, my daughter found it great to play with!

The monitor...

PIV 2,53 Ghz, 1G RAM, 80G HD, ASUS Ti4200 128Mb


Well, that's it for now. All the parts are primed and made ready for the real painting job. My father in law does a great job here

I checked it out today and found that the nice furniture/stained like brownish finish is completely gone! When all painting is done, it will be white and black with red T-molding. I can't wait!

There will be also a coindoor on the front. No prefab kinda thing, a self made door, but... that's for the next update.