I think that build's pretty much spot on TBH. Bit of height for the high ball, weight should mean he's solid enough in contact and be able to bust tackles once he gets going. But not so heavy as to reduce his pace, or probably more importantly, agility. I'm all for our backs being powerful but for those out wide that should be a secondary trick.
Just one thought. Lot more to any position than sheer physical attributes, but are we missing the threat of some sheer gas? Mitchell and M Smith are probably around the fastest in their positions, but not sure that applies to the outside backs. Definitely not the midfield, and while Sleightholme, IFW, Freeman and Furbank are all quick, none seem to be total sprinters like peak Watson and May who at their peak you'd have backed against anyone. Isn't Earl supposed to be about the fastest over 20m?