First up, we know intakes for driver cooling are allowed in the nose tip but could they feed other things as well, like the radiators. I know it's a long way to pipe the air but there is less turbulence around the nose tip and that could allow a smaller intake + less drag. Is that allowed in F1 and would it even work?
Also could you make the front wing like a venturi tunnel (but a lot smaller obviously). Would the lift at the leading edge be to much (thinking of the leverage here) or was this just banned ages ago.
More ideas to come...
