Looking at the pics in your gallery, it definitely looks like an Elco 80 of some sort.
Elco PT boats evolved at a fair rate during the war, and individual skippers mounted them with weapons arrays of all sorts, as in PT109 fame, where a non standard large gun was mounted (lashed) onto the front deck. Whatever they could beg, borrow or steal, especially in the Pacific areas.
It seems yours is a pseudo type superstructure, with bits and bobs from here and there, but erring towards the later version with drop off torpedoes rather than from a tube.
This shows three boats from different eras, showing how they evolved.
PT Boats, Inc.- Drawing Section - ELCO 80'-PT 103 Series
John