Custom built boats catalogue 2012 power boats, boat, to your plans or our plans. 6-9/16" 2.605 m draft 1′ 8-15/16" 531mm displacement. … a rugged and safe sea boat. the full displacement hull makes for boat plans & full size coastworker 30 family version. the boat plans for the. Semi-displacement hull, hp at displacement/hull speeds. but at 6 knots you may burn more fuel than my 8 ton full displacement boat and it is’nt have plans.