I'm trying to build a 6 DOF 360 degree platform and I need 3 powerful motors to rotate 3 arms that hold the center platform. The Pitch arm is the first arm, which will be doing most of the heavy lifting, then there's the roll arm, which could be less powerful, and finally the yaw arm which can be the least powerful, but all motors need to be able to provide torque at a moment's notice and be able to do so bi-directionally since the system will be used to simulate a fighter jet. The platform would be somewhere around 100 kg, which includes the weight for one person and some equipment: screen, joystick, etc. I'm not sure how heavy the arm's would be at the moment.
I don't have too much information on motors and such since I'm primarily a software developer. Help appreciated please.