back seats.

i would like to make the back seat only one seat. looking from the front the left seat is what i want. the back rest is already on it's own but the butt part needs to be cut to fit. the back rest is in it's stock holsters and will still function the same as before being able to fold down and all. but the butt part needs to be bolted in somehow. also i'm iffy on getting the fabric to stay tight. any tutorials on re-upholstering the butt part of the seat.

well thanks for the help....i finished it and it looks amazing!
how do i put pics on here?