Cutting and drilling a Hyper 7 chassis.

Hey guys,

just looking for a few tips on cutting my chassis,
as most of you guys probably already know the chassis is 7075 aluminium

i am intending on cutting another hole for my spur gear, as in flipping my centre differential around,
as this will give me two possible places to mount my motor (behind the servo or next to it)
I have access to a pillar drill and dremmel but no milling equipment, i am intending it to look good, or at least neat :P

if you dont really get what i am trying to do just say so, i re read that and i cant even understand it :S