Hi Iampoor1 (...this name...)
I think I can help you somehow ;D
just few days ago I finished my Gssl Clone, it works and it looks like this:
http://imageshack.us/f/12/c1mx.jpg/
I made the design for the frontal panel all by myself; I started setting the image format like standard 1U rack unit (just google for racks standard measures, nothing hard); Then you just put a "sample" panel for correct distance between knobs and varous stuff; then you just play with your creativity and make this world a more coloured and racky place
The next step is to print, somehow, our creation; there are many ways to do it; if you're a really talented artist, you can just take some spray can and do the job; if you're not such a great artist like I'm NOT ( ???), then I know 3 options;
1) [For B&W design only]: using decals is fast and easy, but very limited in colours and originality (Imho, sometime a classic design is better than everything else)
2) Print your design on an adhesive trasparent film or a vynil sticker, which many uses with great results; films and stickers are weak, so you need a protective films against scratch and hurts (really, without protective film, colour easily go away)
3) go to someone who has a cutting / incision firm: they usually print images on metal plates, but this has many cons... unluckily..
They can ask you several time and money, (approx from 10 to 30 €/$, depending on your dealing skills) and it's not sure that the work will be done well;
There are dozen of issue with the type of file, trasparent or not, the type of machine they have, and ESPECIALLY, the ability of their designer: my front plate has been done this way, but I was careless and trustful... I should have said much more directives instead...
So, choose whatever you prefer! I hope this could be helpful to ya!
Cheerz