I have built two: one ARF and one ARC, both with Plettenberg Advance motors in F3AU motor mounts and 21/13.5 Falcon props. Very happy with that arrangement. I added more green to the wings--but essentially copied the original design and substituted more green for the orange on the fuse for more contrast from the wings. I used a light, gauzy cf cloth around the interior of the nose to about 5" back with thinned Titebond glue to reinforce the nose as it appears pretty light for pattern duty. AT THE VERY LEAST, I would do that and double it back maybe 10-12" and then mount your firewall. I don't think the airplane would live very long without a good quality soft mount. An additional former would probably be a good idea behind the hatch and some additional stiffening for that also. All up with 44 oz batteries, mine came out about 10 lbs/12 oz for the ARF and 10 lbs, 8 OZ for the ARC--so they are built very LIGHT for electric duty. You would want to be vigilant with all your connections and especially the flying stab the way things get shaken with a larger 4S engine.

So yes, it could be done and flown IC with some effort, but you may as well start biting the bullet and come on over to E power and start building your infrastructure! But of course, that's just my opinion!
Also used: Futaba sbus HV and HV servos (local HS matched online 'Club deals')
Mezon controllers, F3AU Batteries, back-up lipo receiver battery which is kept charged by the BEC--separately switched and works slick.