altair industries driftboat plans altair offers complete plans and a construction guide for a 16′ mckenzie river drift boat. (added: 2-dec-2003 hits: 44680) my. I have a brand new sylvan 20 foot pontoon boat, i bought a used 10 foot boat lift on craigs list. my boat is 8′ 6″ wide and the inside of the boat lift is 8′ 11. Boden boat plans professionally designed ocean proven. thousands of boden designs have been built from the stock plans available. many have completed world circum.