I have to agree with Johnbuckner. I'd seriously consider showing the manager of the hobby shop how shoddy his employees' work is and asking for a refund. That's just lazy. And never ever take anything to that hobby shop again to be worked on. The mistakes they made are so amateurish and lazy I truly find it hard to believe an actual business would let it leave the shop like that. I'll give you the list of what's wrong with that setup.

1. You never should cross pushrods. It's never necessary, and it may cause binding.
2. The flexible pushrods (are those Golden rods?) are designed to have the sleeve anchored to a solid surface every few inches. It is especially critical right near the servo arm if you want a slop free connection.
3. Straight control arms are stiffer. That funky angle they to ran your nose wheel is going to give you very sloppy control on the ground. There's no excuse for not using a double servo arm for the rudder/ nosewheel setup. Lazy!
4. Never use EZ Links. Just don't.
5. Servo arms are going to interfere with each other. This is simply unacceptable.
6. Your rudder/nosewheel arm is way too long. You might need that much throw for a 3D plane, but never for a trainer. With that arm, you are loosing torque and precision, not to mention that the right setup would have been with a double arm.
7. As you mentioned, the plane can't even be assembled because they didn't bother to check their clearances. That's lucky for you, because had you flown this plane there's a good possibility that it would have gone home in a trash bag.