I see a seat, a frame and a motor.
Can you use pencil and paper to draw out how you see the rest of the machine working?
I do not want to be a Debby Downer, so I will instead talk about some of the challenges you will have.
I am not sure that drill motors are going to give you enough power to keep you off the ground.
How much do you weigh?
How much will all of the construction, motors, batteries weigh?
Without a detailed layout of your legs, you cannot begin to guess what power requirements your motors will need to fulfill.
I am not sure that your construction material will be strong enough. Again, without a detailed leg arrangement, you are not ready to guess.
Relays and limit switches to control the motors? I cannot see how that will allow you gait control.
How are you converting the drill motor's rotation to usable leg movement?
I am sorry, I failed. I am being a Debby Downer.
But let me try to provide a more practical approach. Do not make a human carrying quadruped. Instead, make a small quadruped. Make one that uses servos for joint movement. Learn a bit about mechanical construction. Learn a lot about programming, inverse kinematics and quad gaits.
AFTER you have been successful there, make a bigger one that can carry some amount of payload. 10 pounds or so. Learn about using more powerful motors and the limits placed on movement by the length of the legs you are trying to lift with.
Then, again after success there, scale up.