I realize this thread is kinda dead but hopefully somebody is, listening...

I was wondering how you all thought this plane would do with the Zenoah G20ei. I realize it would not 3D, and that is not my intention. I want to do scale aerobatics with a scale plane and the WM Extra caught my eye. If someone could give the dimensions of the firewall including: height, width, and distance from firewall to end of cowl (spinner). Thanks.

Shane