HFT isn't really a new sport it's how FT started off back in 1981 with sporting air rifles and low power scopes and we were allowed to use any position we liked. I don't mind the rest of the rules you have just the sitting one I find it a little unfair on those that can't lay prone .
Walther LG300 Dominator,sightron 10x50x60 ft totally awesome combo
Walther LG300 Dominator,Leupold 20x50x50 spare set up
Air Arms TX200,8x32x44 Buris signature
Air Arms S400,10x44 Viper