Marine modelling international tug boat plan sets for building working scale model tug boats.. Orion mouldings . scale model boat hulls. tel: 07812410173 0191-5250104. web www.orionmouldings.com. email [email protected] tug hulls. 32” long 9” beam 1:32. A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways..