The Prout brothers built Gemini and asked Crosfield if they could use his design for future customers .
Crosfield took a drawing board home and , using Snowgoose 's hot moulded plywood hulls , designed her himself .
The Prout brothers built Gemini and asked Crosfield if they could use Crosfield 's design for future customers .
Crosfield took a drawing board home and , using Snowgoose 's hot moulded plywood hulls , designed her himself .