A good gamer case can be had for around $100? Why bother with this? I looked up the specs and Dell seems vague on whether the thing houses an ATX motherboard/PSU or something proprietary. I'm just not able to discern any tangible benefits for even attempting to go this route.
A 2600 has a worthless (for gaming) CPU, terrible memory (DDR!), horrible video capabilities and is a generally ugly looking case. Unless you're hiding some detail from us, maybe you need to rethink your plan.