Hello, I saw you pointed to my blog so I thought I might help.
The Super Disko was designed by Gilbert Caroff, a pretty famous French designer, now retired.
http://www.caroff-duflos-architecture-naval.com/?rub=Anciens Modeles
It is the longer version of a popular model he designed called Ile Disko (which is an Island on the western side of Groenland). The super Disko was the extended version. They were mostly home built, a few of them by the same guy in Quebec in the 90s. They are slow boats, rather heavy but built like tanks, very spacious and if you're lucky like I was, very well finished and thought out inside. Some were keelboats and some centerboards.
If you need more info, email me through my website
Bedardyachtdesign.com
Regards and best of luck,
JF Bedard