Yes jon, it's used as a research and dive boat, based in Buckie i think.
i have a waterline a5 size ga plan and side elevation of a mclachlan that i could scan for you, but if you contact the HUMBER lifeboat station at spurn point, they still use one, or did till recently as their boarding boat to the severn, and might have some decent plans of one that they would almost surely copy for you.
neil.
the only difference basically between the boarding boat and the true mclachlan is that they use an outboard to power the boat these days instead of the mclachlan's water jet drive system, the hull is very similar in shape and size.