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. Fenwick williams catboat work done by michael storer boat design. change scantlings for simpler construction in cedar strip; optimize foils; design a birdsmouth. Study plans : eur 15: building plans: multi-chine steel & aluminium – quick assembly: eur 950: building plans: round-bilge wood-epoxy & glass-fibre wood core.