Hi TJ,
TL;DR
If you can create a bunch of text files, that contain your tiddler content and if you can create some .meta text files that describe your sound and image files, imo TW can handle it.
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More details, but still a bit simplified.
If you can create several text files like this:
eg:
filename: myTiddler.tid
title: tiddler name
tags: [[tag with spaces]] tagWithoutSpaces
created: 20150619013100
Your Content comes here.
TiddlyWiki can import these files, with drag and drop or you can build it with the command line programm
eg: tiddlywiki editions/myEdition --build index
Handling image and sound files is possible too.
eg:
the sound file is named mySound.mp3
You need to create a matafile like this: mySound.mp3.meta that contains the following
titel: mySound.mp3
tags: aaa bbb ccc
The same thing works with images. .... BUT ... be aware. If you have many big files, they should be linked into the TW file, and not included. As you wrote "(relative path reference)"
editions/myEdition ... is just a directory structure, that we call an edition. An edition consists of many single file tiddlers, that can be built into a tiddlywiki.html file.
I'm sure there are some more questions, but It should be enough to get the conversation started ;)
have fun!
mario