I currently use an old Antec Full tower case that uses steal. I used a dremel to make my cuts for my radiator and everything else. You just need a steady hand, LOTS of cutting disks and a can of compressed air
OH and a nice cold beverage! (for afterwards when your hands and arms feel numb from all the cutting
)
Also about your temps....... those are way high in my mind. I am using the Dtek heatercore with a Sunon 120mm 108cfm fan and the radiator is cool to the touch, even with my Tbred 1700 @ 2310 @ 2.05V. My core temps are about 38-42C full load depending on the time of day. Even when I cranked my CPU voltage all the way up to 2.2V, my core temp was only 45C under load.
If you heatercore is warm to the touch, that means you do not have enough airflow through your radiator. Try getting rid of one of the fans and getting just one to work. You should feel at least SOME air moving out of the apparatus (depending on how you setup your radiator + shroud + fan). I would feel really nervous if I saw my core temps above 50C with a 2.0V core..... (heck, I am nervous when my core temp is over 40C with a 1.9V core
)