Pretty much the reason for UL weight is if you crash out of the air, you only make a small crater in someone’s property. More weight, bigger hole. More weight means insurance and being able to defend yourself if sued. Doubling the area of the T2 wing needs a big think. That is a major restructuring. Although many elements can be the same, you can’t just stretch it and be ok. T2 wing has to be metal covered. If you go fabric, the whole wing guts are different, just like Rockiedog said. The Hummel UL I have seen fly is probably faster than UL limits, but it does make weight. It has to be using .016 skins but the spar is almost a foot deep to be strong enough. .016 skins look like aluminum foil.