I think what you have to do is either get the decals custom-made so that you can stick them onto the bottom of the panel (like a permanent sticker) or you get it printed on. If you have a simple 1 or 2 colour design with no shading effects, the latter is easier, but if you want them like the arcade, you'll have to go with the former.
Hope that helps.
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I used to be active here lol