Building a 5'6" squash thruster for a 14 year old kid with a fair amount of experience. He weighs about 90 pounds. How wide would you make it and where would you point the wide point. Wave type various but mostly knee high to waist.
Looking at around 17" wide, WP back of center about 3", thickness around 2 even.
If he’s always riding those smaller waves, you might try a twin for extra snap and looseness.