In reply to:

... and I'll also be drilling out the holes for them a little bit ...


I'm sure you already know this but when you drill these deeper be very careful that the drill doesn't try to 'screw' itself all the way out of the other side. Because of the through hole there will be very little resistance to the drill. Sorry if I'm teaching my Granny to suck eggs here.
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Marcus 32 gig MKII (various colours) & 30gig MKIIa