Just bought the 4511 and I was putting it together yesterday evening and realized, whomever was in charge of making the assembly instructions should be fired. The labels on the bags of bolts don't cross reference to the instructions at all. They are labeled figure A, B, C, and so on and there is no figure A, B, C, in the instructions. Furthermore there is not an illustrated parts breakdown for anything. I am an electronics technician and work on million dollar aircraft. If I am having problems deciphering the instructions I wonder how they rest of the world is doing.