The first Willow electric is about finished and it looks like it's going to be a belter. A 5S 2700mah power pack driving a B50 8L fits comfortably and delivers 500W per Kilo. The final model has come out at 2.9kg. With the willow wings the strongest I've come across they're taylor made for the job.
The only extra part needed is a motor mount as the internal servo tray and inner nose are reversed and slot together perfectly.