I think you mean the contents of Sheets.vol, which has been unpacked, and the graphics which can be exported with the op2art viewer. I don't remember if there is a mass export option though.
At any rate, there are various bits of code posted that can more or less extract most of the resources from Outpost 2. Admittedly though some things concerning units are hardcoded into the executable.
And yes, there is a public SVN, but no source for the game. Updates are done as binary modifications. The SVN contains source for new levels, headers to interface with the game, models of internal game dynamics, and utilities to extract certain resources.