After having some success building the twin orekelon gun for the stern of the brave borderer, I had toyed with the idea of making 2 torpedos for each side of the deck, these items are readily available to purchase, but thought I could do as good a job. The only stumbling block was the tapered rear end. I had successfully made the front end using 18mm plastic tube with a domed end cap.
The next bit of luck came last week when I acquired a small Myford lathe, so using a piece of the wifes broom handle ,turned 2 tapered rear ends, I then made 2small 4 bladed props and 4 fins, fixed in position I was pleased with the result.
Next using the photos supplied be our friend Rowen in Canada I made up 2 racks for the deck to hold the weapons in place, they may not be perfect ,but using a bit of modellers licence I think they are acceptable if you don't put you glasses on and view from the lake side, anyway see photos below this may give others a bit of help.