Dreamweaver templates are all based on specific tags in the form of html comments. If you research the different tags and their usage you can use Templates as well as Library items (.lbi's).
You could probably even create some auto completion rules in Eclipse.
I dont know if a list of all the tags and their uses exists directly but there is a perl module for generating them, although im not sure which version of DW its based on. But you might be bale to extract the various tags from it baring an easy to use authoritative document.
http://search.cpan.org/~whytewolf/HTML-DWT-2.08/DWT.pm
Actually now that i think of it... if they want you to take part in the build out youll need to find a library you can use in eclispse as an external tool or natively in order to simulate the various update features within Dremaweaver. That module might do the trick... if its up to date that is.