For me I'd order a 60+ ' yawl. Full keel
, moderate cut away for the forefoot.
and horn timber -Borneo ironwood
Planking below waterline- either Borneo ironwood or Angelique
Planking above water
line- Myanmar teak
Frames- steam bent Balata
Floors and fastenings-Monel
I'd go with double diagonal planking with a fore an aft top layer (epoxy and screws between planks- through fastenings to the frames)
glass on ply deck
on ply on teak coachhouse and roof
As a fan of long and skinny I'd guess a beam of no more than 14 feet or so at that length..