Moki I just got one {46 size} 2 weeks ago and have it assembled with a YS 63s and futaba 3152 servo's all round. I had to put the battery up under the fuel tank to get it to balance at 5". The manual had a amended sheet of paper included which said that the plane could be balanced between 4" and 6" from the leading edge.

Hopes this helps

Damien