Question on "Document creation workflow"

[Erwin Panen <erwinpanen@fastmail.fm>]

Happy New Year to all listreaders & users!!

I'm debating a possible workflow, here's the idea:

Would the following be conceivable?
- I'd like to prepare a legal (or comparable, just an example) dossier / 
document
- document would contain links to other documents, even snippets from 
such document (use bib reference on self made document?)
- Document needs to be exported to:
   - doc format
   - pdf format
   - html format (ready to be publicezed on web server)
   - preferabley links need to remain intact & functioning

Is this conceivable at all?
Is anyone doing something similar? Example or pointers to example?
What would be the best approach to treating linked files? (even 
considering using git)
knowing that you'd be working on multiple PC's even multiple OS'es?
I'm mainly worried of the relative position of the linked files..

Thanks for your precious input!

Erwin