Yeah, those round buttons seem very simple. And they seem compatible with the currently offered lighting hacks (with a little work). Wait, are those buttons in the linked document the Farenell ones?

Anyway, yeah, round buttons. They even seem hackable to be compatable with the lighting kits. Mmmmm, lighting kits.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set