Yes,the reversible engine thing is very important on a multi prop boat, it greatly effects steerage.
Another point is the night thing,these were predominantly used in night interdiction of Jap supply lines,in the early to late war period...they were barge busters, that's why the 37mm gun on the forecastle was added,same one as in a P 39,also the rockets were used to make hit and run raids on coastal positions,some had mortars to,an some even went so far as to remove the aft torpedos to save weight because their were no Jap ships to sink in the later part of the war at least in the are's they were being used. They made some atacks on Jap fleet units in the early solomans champagnes.
Another point the bow 37mm i am pretty sure could not be used in a AA role.
And as far as sinking a destroyer with the guns i think not.
the torpedos are aircraft types ,adopted on late war boats to save weight,they role into the water. As opposed to the early boats that had "tubes" that shot the old MK14 torps.
these US PT boats also have a glass jaw, you better get some gunners man if u want to live, for if u stop your toast.(or at least u should be)
By they way i can't weight

Oh and why not a German S-boat(E-boat to u British types)they were way nastier,bigger faster made out of metal,had armor, protected gun mounts reloadable torpedo tubes,diesel engines,heck even one of Karl Donets sons rode on one.
Brady