Im not to sure I would convert a front mounted prop designed plane to ducted fan into the narcells as the planes CG location would be greatly moved and to get the correct CG there may be a fair amount of wing load to get the CG back to where it should be. Im not total sure on this
with correct battery placement you might be alright, Im sure someone will chime in here and give you the answer you need.
hope this could be a little help.
Best of luck: Chuck