I've used the LINDBERG Coast Guard tug and the the old PYRO "ATLANTIC" tug models. Keep in mind most of the old Eastern rigs were of wooden construction and had rounded sterns vice square stern of the Western rigs. The Lindberg CG tug is a fairly easy conversion, I moved the cabin/pilot house aft (after doing a little cut and fit). The Pyro tug can be converted in a similar fashion. I never tried converting the Pyro "North Atlantic" fishing boat, but most of the wood Eastern rigs were about 60' long, smaller than the North Atlantic boat. The Gulf Shrimper can be converted but the stern would have to be rounded. And don't forget to "weather the heck" out of these old work boats! Good luck...