There are PowerPoints that have been made into pdf files. In order to open them you will need to have a pdf reader. Sorry, they are a bit slow, but should load in a minute or so, be patient.
A general introduction to Sikaiana life, 1980-1993 Overview of Sikaiana
A PowerPoint about Sikaiana marriage, 1980-1993 Sikaiana Marriages
The use of traditional ritual to greet important visitors, 1980, 1982 Ritual Redefined