Hi Dan,
You live in Sydney?? Join WSAAG and come up to Linden Observatory.
I would be happy to show you how to capture galaxies.
The attached image was captured with the DSI III.
You certainly appear to have the right gear to image galaxies.
If you don't already own them, you need f3.3 and/or f6.3 focal reducers.
Go to the web site
http://wsaag.org and view my galaxies in the photo gallery.
Regards
Gerry