I am actually considering building an Amiga tick in to the side of the case, but I would have to use very small bricks for that and I'm not sure what effect it would have on stability. I'll experiment and if it's stable enough I'll leave it in.
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moto
If stability is becoming a problem you could consider going the other way around, where the tick stands out from the casing instead. It won't be the same as the original though.