4 planing vs displacement boats there are two re-occuring questions that we hear from our customers. "can i put a sail on (name of planing boat)?". Study plans are available for some of these designs – remember a study plan gives you more details and a wood materials list usually on two a1 sheets. 7 metres long and 2.35 metres wide the aluminium punt is a simple to build, practical work boat. constructed from standard sized plank extrusions, this boat can be.