I have 2 server setup

Server 1 - GroupWise (incl. GW DMS) + Storage for Marketing Team (files, Photos, Video's etc)
Server 2 - User Home Directories, Accounts, CAD files, General Office file (non-dms)

Company wants to relocate the Marketing Teams to another location - (more Creative location !)
and Engineering needs the physical space currently occupied by the Marketing Team!

win-win.....

One suggestion is to move the server running GW to the new location and setup a Site-Site VPN
The engineering department only needs the Accounts, email (GW) and user files
Marketing users home files can be re-located to the Server 2 - GW
Document Management is only used by Marketing (few others but I think can be taken out of DMS and saved in the file system)
Current thinking is Bonded ADSL (using 2 x ADSL lines)

Is this realistic ?
would eDirectory work in this way ?

any gottcha's

Better suggestion ?

I'm looking for ideas...