Mini Magnum?
heres a micro hawk as my input... tho 65% of a Magnum is far to small, 20, maybe 30% if your nuts is small enough.
i'd keep it exactly the same colours too.
you would only need one mini for the ailerons, the new sd250's have more go than a 3003!!! i also susgest keeping the wing loading lighter than the 50 size, you'll want a better glide on the smaller plane.
The micro hawk only need to be slightly bigger to be fine for 25 use, the current Magnum is still small enough for the 36 size engines.