altair industries driftboat plans altair offers complete plans and a construction guide for a 16′ mckenzie river drift boat. (added: 2-dec-2003 hits: 45653) my. Bruce roberts official web site powerboat plans power boat kits for steel boats or aluminum boat designs, cut to size boat kits, part built boats or complete boats.. 20′ (6.1m) fast coastal or inshore cabin cruiser. for construction in plywood or as a mould for grp/frp. beam 7’6". draught hull only 1’3"..