How about stripping out the turret and turning it into a second seat for a Radar Operator. Have the radar dome out on the wing. The four cannons firing forward should be more than enough to make it a killer night fighter.
Second option, dump the turret, seal over the rear fairing and fill that space, as much of it as possible back there, with fuel tanks. Make it a long range heavy fighter.
Just some thoughts that came to mind looking at the griffon on the front. Nice looking bird Clave.