How fast does it go? for estimating the speed for small outboard planing boats see planing speed boat chart. this chart should be used for general estimates. Length 15 ft 6 inches x 4ft beam estimated weight 90lbs (probably an overestimate) plans $75 including detailed instructions payload – one person – second person or a. The solo flats skiff 14 is considered both a fishing kayak & a one-person skiff. purchase our kayak plans to learn how to build a fishing boat easily & quickly..