Whether or not this will work depends on where you live. An attic is designed to remain the same temperature as outside so, if it gets very hot/cold where you live you will have to: frame up a small room, insulate, heat/cool, run electricity and put some serious thought into where you will get water from. But there have been some very well put together attic grows here on Rollitup over the past couple years. With the correct planning and execution you could have a very good grow. Good luck and happy growing!
Chillums