Professor, if we were a dock yard of choice of the westerner (trinco) howcome our technicians never thought of copying these designs and manufacture a navy of our own? Why didn't even prakramabahu the great not think of this and incorporate a navy to our repertoire of military forces? Afterall any conquerer has to first sail to Sri Lanka in order to conquer it making the seas the natural choice of first line of defence and a navy would've been an obvious choice as a first defensive force?