Coach roof doesn't quite work for either the Atkins or the Alejuela but the similarity is very close nonetheless. Here's a link to some info on the Alejuela. http://www.js-boatcharter.dk/alajuela/haleluja.htm
Of course the coachroof and cockpit combing could well have been modified. The only Bluewater Boats I could find (well google could find at least) are makers of aluminium fishing boats in the US and a mob making canal barges in the UK.