I just finished assembling mine. It came out perfectly balanced at the 4-5/8" balance point. However, it still needs to be balanced laterally. The right wings are heavier than the left.

I tried to run the antenna wire down the tube provided before installing the servos, but still couldn't do it. I came up with using a length of push rod I have for park fliers. I run that down the tube from the rear, then glued a sewing thread to that and got the thread in the tube, then glued the thread to the antenna and then pulled it through.

My only other problem was my big fingers and all that tiny hardware.