Here are a couple of other possibilities (but both very different!) that would probably suit the intended purpose with a little adaptation :
Selway Fisher are in England, and here is a design for a 35' sharpie -
http://www.selway-fisher.com/Yachtsover35.htm
Paul Gartside is in Canada, and here is his range of very husky motor sailers - I am sure that they could be adapted with a cargo hold if desired -
http://www.gartsideboats.com/catsail6.php#silvey
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for an impartial yachtsman's guide.