I say axe the idea for the clear box. the right paint in the right places will make you current case look great. I know first hand as I was inspired by whitlock's mod.

get some krylon paint and follow whitlock's grey and white G3 mod guide. one colour everywhere there is frosted plastic and another everywhere there is blue.

good luck! smile

btw, I have pretty much the same mac. b&w with G4 500 upgrade. did mine black & white and love it.
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Mac mini C2D 1.83GHz - 2GB RAM - 200GB 7200rpm HD
Sawtooth w/G4 1GHz - 1GB RAM - SIIG SATA w/2x1TB HD
B&W w/G4 600MHz - 1GB RAM - 2x80GB HD
Sawtooth G4 400MHz - 512MB RAM - 40GB HD
Dell Ultrasharp 2007WFP 20" Widescreen LCD
2.94TB Total Storage