How to get the case off a Netgear DG834G

So after gingerly snapping plastic bits off my router, I discovered that the feet are removable and conceal (torx) screws.
Why take the router apart? I’m trying to solve a cooling problem that is causing it to lock up. It seemed to work well on its side, so to allow air to flow when it’s horizontal, I’ve drilled holes in the top of the case:

The way it is designed, the top curves a bit, so I hypothesise that without these holes a pocket of hot air builds up and can’t escape. Hopefully this will improve things.