Looks promissing, although I think there is still a lot of work to do.
I had to get the svn archive to run the examples, the zip files you posted are not complete. I am looking forward for further progress.
I read the todo-file, for items 7 and 8, check the
install.sh file of the djvu-plug-in on how to link file-extensions to a program and linking an icon to file-extensions.