i want an object rotate 45 degrees more than an other one

i am trying to make a spaceship controller. my idea was to use a cube make the spaceship move in the direction its aiming, and then the spaceship model to add details in this case, to tilt a bit while it is yawing. here is the code i`m using:

 var forceCube : Transform;
 
 var rotBufferZ = 0;
 var rotBufferY = 0;
 var rotBufferX = 0;
 var maxRot : int = 1;
 
 var roll = false;
 var rollDir = 0;
 var rollSpd = 1;
 
 function Start () {
 
 
 
 }
 
 function Update () {
 // this you`ll see why in a bit
 if (Input.GetKeyDown(KeyCode.A))rollDir = -1;
 else rollDir = 0;
 
 if (Input.GetKeyDown(KeyCode.D))rollDir = 1;
 else rollDir = 0;
 
 //here i use it to change the maximum rotation angle from 
 //positive to negative based on in what rotation i want him
 //to rotate  
 maxRot = maxRot * rollDir + forceCube.rotation;
 
 // if it can roll hell do so
 if (roll){
 transform.Rotate(rollDir * rollSpd, 0, 0);
 }
 
 //check if he has gotten to the max rotation to make him 
 //stop rotating 
 if (transform.rotation >= maxRot)roll = false;
 if (transform.rotation >= maxRot)roll = false;
 
 }

i guess a local variable would also work but i don`t know how to use them

thanks to all ho tried to help