lian li v2000 help

hi all i have a lian li v2000 and next few months am going to be fitting a custom water rig in there but the place i want my thermochill pa120.2 there is a bracket for a psu


the bit in there with all the holes (well the bigger holes) now i would like to remove the bracket but am not sure the best way to do so

just drill out the rivets works pretty good. comes out pretty cleanly. i even did some extra ones and put in plane screws it was so easy. dremels ftw. just ease a small drill bit into the rivet and itll almost fall out. this is my v2000 with a vertically mounted 240mm i had help from voyeurmods.(pic a lil old)

cheers for that what size drill bit would i need (so i can nick from work lol)

lian li's are so purty

i've got one too, but a smaller version.