“Guillaume le Conquerant” is French for “Willliam the Conqueror.” The Heller kit is supposed to represent the ship in which William the Conqueror sailed from France to invade England in 1066. In fact it’s a typical Heller travesty - a modified reissue of the company’s “Drakkar Oseberg,” which was a miserably inaccurate sort-of-replica of the Oseberg Ship, one of the two large vessels on exhibit at the Viking Ship Museum in Norway.
Historians have established that WIlliam the Conqueror’s ships didn’t actually look much like Viking longships - and still less like the Heller disaster. Anybody interested in a model of a Viking ship would do much better with either the Revell or Emhar kit. Both those are excellent. Here’s a thread about a model I built from the Revell one: cs.finescale.com/…/1701192.aspx .
The larger of the two Imai Roman warship kits is still, I think, available under the Academy label. I’ve got one in my stash. (I bought it as a project to build with my grandson, but it’s way too complicated for that purpose.) It’s a superbly molded kit; Imai was, I’m fairly certain, the only manufacturer to figure out how to make realistic injection-molded deadeyes. But it has the same big problem that the little kit does: half the oars are missing. Two possible solutions: buy a second kit just for the oars, or use the kit oars on one side of the ship and display it on a mantle or shelf, with the oar-less side against the wall.
Imai arguably made the best plastic sailing ship kits ever to come on the market. Unfortunately the company went bust in, I believe, the early 1980s. The kits turn up now and then under the labels of other manufacturers.