mmm and mm waranty question

[lind5]

i was just wondering
i have just purchased a new m/monster from mike and have been reading about the mods to the outer case that people are doing on here
they are saying that aslong as you only mod the case (cut big holes in the bottom side)
that castle will honer the warranty
im over in england and and if i had to send it back to repair it i guess it would take some time
i was told for piece of mind to do the mod before i start using it
only becouse of a problem with the wire for the fan

i also use a m/max this gets a littlewarm so ive been told to add a fan to the heatsink and drill the bottom of the case and add a fan on the bottom .would this also be ok with the warranty if it needed any work