Short answer yes, long answer:
You can't do this to create "proper" Word documents, however you should be able to acomplish this on any platform by building the word doc from HTML and saving it with a .doc extension (instead of HTML). You can put anything in there, custom layouts - I'd probably stick to paragraphs and tables and floated elements (like imgs and such).
There may be extra code you will need in the HTML doc (for instance to make it open in page view rather than in HTML view) but you can figure all that out by saving a word doc in HTML format. :) There's also a lot of information on the internet about it if you know where to look.
I did something like this not long ago. I'll see if I can find an example and post it here.
Update
This is the only "custom" stuff I have in my html word doc:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:w="urn:schemas-microsoft-com:office:word"
xmlns="http://www.w3.org/TR/REC-html40">
And this - to make it open in Page view:
<!--[if gte mso 9]><xml>
<w:WordDocument>
<w:View>Print</w:View>
<w:Zoom>100</w:Zoom>
</w:WordDocument>
</xml><![endif]-->
The rest of it is just standard HTML and CSS (remember to put CSS INSIDE the HTML document in <style> tags - word isn't going to remotely fetch your css files).
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