Rob, Just thought you might be interested to see how far I've got with designing a new Fascia. It's far from finished but it's a start. You'll notice I've designed a new Knob and the buttons (at the moment) are round. I've designed it with ease & quickness of manufacture in mind as we can't machine from a Solid Model yet at work (we currently just have 2-1/2d CAM software - something I'm trying to get changed!!). I'm happy to collaborate on a design if you want, or you may want to do the whole thing yourself. I'll leave it up to you. Of course, with your CAM software we could do something a bit more adventurous than my current (unfinished) design.
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Marcus 32 gig MKII (various colours) & 30gig MKIIa