[grasshopperbe]

i have an aopen hq08 case and i am planning on cutting out the perforated parts, since they hold up waay to much air, esp in the back.
do i need to take out all my parts(mobo, hd's, ...) or can i just cover the back of the hole while cutting ? id hate having to take everything out of that case again, i think id rather buy me a new one if everything has to come out anyway.
(ive been looking at those old chieftec da01-w cases, and they seem to have quite some advantages over my current case (placement, rails, side door panel, 80mm fan holes instead of 60mm in the down rear)

any advice on if i do the cutting on my current case is very welcome, i haven't done anything like this before
(im going to buy a dremel if i do it)