Many years ago I suggested making the main uc retract forwards into sponsons like the A-10, freeing up the inner wing volume for internal fuel and a couple of more pylons and the ability to carry more stores on the centre-line. The drag of faired-in sponsons is neglibile, as is that of slipper tanks should you go for them instead. The unguided store delivery performance of the 100 Series Hawks is pretty good and with its reliabily and legs it makes for a useful bush warfare aircraft as it stands.