The forms of hypermedia documents vary considerably depending upon the platforms that carry them; but the rules that constitute the design of hypermedia messages may only be indirectly technology-dependent. The following reports on an attempt - in collaboration with the Kon-Tiki Museum in Oslo, Norway - to publish material on three different digital platforms based in a common design model. First, problems with features of hypermedia documents and their building blocks -the various information types - are discussed, then a general design model is presented, following which different technological platforms are described. The paper closes with a discussion of the general perspective in relation to experiences with crosspublishing the Kon-Tiki material.