How, exactly, are the ships actually produced?
Is it a variant of the ship-class selection method? IE: roll against a percentile chance for the first ship, if it passes, good, otherwise, move down to the next ship etc., or is it a straight random selection...
And if it does use the check ship 1 then move to the next ship pattern, what order are the ships loaded up in, and what governs the percentile chance a given boat is built...