The wing mount is OK, nothing too special.
Its not adjustable and the wing does sit fairly flat, so the down force at low speed will be negligible.
I chose this option as I am a lazy bum, and couldn't be bothered to track down the buggy wing part no.s

as for motor/cells, I am awaiting some enlightenment from Mike,
and yes it is a 7XL, borrowed from the Maxx ;)