First - be warned. That kit is a modified reissue of Heller's "Drakkar Oseberg." It was originally released more than thirty years ago. I bought one at that time, thinking I was going to build a scale model of the Oseberg Ship, one of the two major surviving Viking vessels. But the kit bore scarcely any resemblance to the actual ship. The proportions were way off (the bow and stern were ludicrously tall in relation to the beam and length), and the Heller artisans had paid no attention whatever to the decorations on the bow and stern. They made those decorations abstract squiggles; on the real ship they're stylized snakes. I got the impression that the kit designers hadn't bothered to track down a set of plans. The moldings look like they were based on photographs - and not very good ones.
I imagine the name "Reine Mathilde" ("Queen Matilda") is supposed to make it look like a ship from William the Conqueror's fleet of 1066. I think Heller added some new bow and stern decorations, but didn't change anything else. I assume the proportions of the hull are just as bad as they ever were. The very title Heller has put on the box demonstrates that this kit is a merchandizing ploy. William the Conquerer wasn't a Viking - and neither was his wife.
To my knowledge there's been only one reasonably accurate plastic model of a Norse vessel. Way back in 1977 Revell made one, which was called simply "Viking Ship" and was originally issued in Revell's "Quick Build" series. (I guess the logic was simply that it didn't have many pieces. Nothing about it was especially simplified.) According to Thomas Graham's book, Remembering Revell Model Kits, the kit was based on a full-sized replica in Grant Park, Chicago. That replica, in turn, was based on the Gokstad Ship - the other major surviving Viking vessel.
The real Gokstad Ship was buried under ground, and the tops of the stem and sternpost had rotted away. Revell added a conjectural dragon head and tail, but otherwise, if my memory is at all reliable (which is questionable), the kit was a remarkably accurate and well-detailed reproduction of the Gokstad Ship. According to Mr. Graham, it was also the last new sailing ship produced by Revell of the U.S. Every Revell sailing ship kit released since then either has been a reissue of some sort or originated with Revell/Germany.
Frankly I wouldn't bother with the Heller kit; the Revell one is worth seeking out, but probably scarce. If you do want to try a model of a ship from William the Conqueror's fleet, the primary source to start with is the Bayeux Tapestry. It contains lots of "profile views" of ships, including at least hints of their color schemes. The Tapestry is reproduced in many books about the medieval period. (The old National Geographic book The Age Of Chivalry has a beautiful, fold-out version of the whole thing - which is over a hundred feet long, I believe.) There are quite a few good books about Viking ships. The classic is one from the 1930s, entitled simply The Viking Ships, by a Norwegian scholar whose name currently escapes me. It contains plans of the Gokstad and Oseberg Ships. The book The Viking, from the Tre Trekare firm, has lots of great photographs and some marvelous drawings. A good, basic modern source is the relevant volume in the Conway Maritime Press series, "Conway's History of the Ship." The Viking vessels are covered in the volume called The First Ships.
The only website I know of is that of the Viking Ship Museum, in Oslo. I looked at the site one evening; it's a good one, with some links. I don't remember the web address, but a search engine would find it.
Hope this helps - and isn't too discouraging.