For those who like to work with numbers and theories:
what if -- you were asked to design an aircraft which would perform much like the good old Piper Cub--
carry two people on at a cruise of 80 mph- same power as original
BUT-- you were given a inventory of material to work with that is ALL 50% lighter than anything available for the original.
Same strength n power but 1/2 the weight.
What would your airplane look like?