So. It was my first time with a dremel and I've screwed up the casing pretty hard (well, not that hard, just the buttons, but it didn't sit with me so decided to go "all the way". Screwed the first two front button holes, then after doing the next two I got better. Apparently my dremel was working too slow and suddenly the day after it started working normally.
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(by now I'm quite good.)
So I've said I'll completely scuff it up (already started but will continue later) and make a Fallout 2 themed case. I'll also cut out the part with the speaker and completely expose it (through transparent acrylic with a green LED underneath). Also will cut the lower left and put a vault-boy picture with black surrounding on green acrylic so it he only glows green with the underneath LED)
I'll be also ordering a new one so I can have two cases. One really clean and nice white one and one "burnt up", painted Fallout themed "old one". I just need to get the red buttons for the fallout one.
I've decided to go with 6 button on the front and will include 2 tactile buttons on the back
I've used an old R1 and R2 PCB from an old broken joystick and filled it down with a dremel all the way until I've basically reached the copper part (it's now paper thin) and glued it to the PCB. I'll be using a flat cable to for all the buttons to the PI and the two extra tactile switches will go separately (Those I'll connect directy to the GPIO to avoid routing wires down to the PCB and then back again).
[spoiler="PCB - Front"]

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[spoiler="PCB - Back"]

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I've drilled the kitsch-bent PCB to more easily route the wires of the new 2 buttons.
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So, I've ordered two screens and are still waiting for them (and the battery). But will also order two more cases. One will be for the clean gameboy with raspberry PI, and the other will be for my second project in a month or two.
A Gameboy equipped with
http://www.intel.com/buy/us/en/catalog/ ... 162/501535