The hardest thing is going to be designing a fully enclosed bellypan that will encompass the whole of the underside of the engine, given how much intrusion the silencers have into this area. The ground clearance and heat, will probably not allow a design that encloses them as well, so doubtless it will stop short of the silencers and just cover the first two thirds of the underside area. Not an ideal solution, but with all the ironmongery going on, its hard to see how they will get around this.