anyone know how to remove the lower part of the rear seat?

Never done it on this car, but if it's like 95% of the other cars, push on the front of the seat towards the rear of the car and downwards. It should pop up, and then you can slide it out.

ya thats what i thought cause cavy's are that way i think

Well, if its like the RL, fold down the back of the rear seat and you can see 4 big bolts holding the seat down.

I'd guess it's the same way as the Red Line, and not as I had previously guessed.