ABLE's lines drawing by designer James McGruer. This Lorne Class drawing shows his distinctive stem profile. The design seems most influenced by the Folkboat. The Lorne Class design (Feb. 1960) probably inspired the British 'Twister' design of the mid-1960s, but the lines of the Lorne Class are considerably more complex (and more difficult to build).
The subtleties of ABLE's shape are not lost on me.