The only plane that I have ever put together without modifying anything was my Avistar trainer. Since it was my first ARF I followed every instruction to the letter and didn't change even the hardware. Of course a couple of months later, I had to change out the fuel tank due to a leak, but otherwise everything was just out of the box. Since then, I haven't had a single plane that I haven't made modifications to, and that includes my Something Extra (kit). Even with it, I changed the landing gear, tailwheel assembly, and modified the fuel tank shelf so that I could take the tank in and out through the servo area. It just seems there is always something, no matter how small, that can be done.