Question about 85 camaro body work?

Ive got an 85 camaro that im working on at the moment. Im not all that worried about what im asking...just curious. As many know...the trunk in the car has the huge hump that the t-top bag sits on. I was wondering if fabrication could be done to the car to take the hump out, basically making it flat like a normal car. How much work would be involved and off the top of ur head how much would u figure the work to cost???....JUST CURIOUS