RE: GWS Help
I have flown one with a hacker B20 on lithium cells.
Not sure of the exact setup that he had, but it had plenty of power probably more than it really needed.
It flew ok but did have some odd tendencies at different speeds. Could have been due to some warpage or surface setup.
Takeoff's and landing would need to be on a smooth surface.
From what I've seen it will fly on the stock setup, but that's about it.
Bill