Well as I mentioned, I buy the new computer for my desktop and move the oldest remaining desktop to the mame cab. So the case is really for the new desktop, but eventually ends up in the cabinet (or for someone in my family) when it's the oldest. So is there any other benefit to removing the case besides cooling? I'm honestly curious. If you weren't having cooling issues and this is a normal sized cabinet, then yeah I'd be surprised you would go through the trouble to remove the already existing case and screw the motherboard into your cabinet.