I don’t think I have seen any traction or ploughing engines done with the flat tank and basket arrangement, it would make a bit of a change. Could even go to a straw burner and have the working feed arrangement. Might all have to go that way if coal becomes a problem to source.
Though if you did an export one you would really have to do a canopy which makes it a bit harder to drive the model.
Talking of gears none of Hainings are really correct as he uses the same DP throughout but a lot of Fowlers had smaller on the crank and getting larger as they got to the final drive.