If you will switch sides with the elevator and rudder rods you will make life a lot easier on yourself. The original builder likely got that wrong, so now you can correct it. If you do that, getting it all working right will be a simple matter of moving the double servo arm to the other side, then setting up the elevator arm to point outwards toward the fuselage side instead of inwards toward the other servo. If you have smaller servo arms use them, but if not just cut that one down to make it fit. There's no such thing as a servo arm that's too strong, after all. I know it will take some time to get the switch done, but that's the right fix for your problem and the only way you can get straight shots to all of your controls and no chance of the servos interfering with each other.