I notice increasingly that there are a number of projects out there that involve converting old games into usable source code. OpenNFS(need for speed) is the latest one I've discovered, along with SDLPoP(prince of perisa) and OpenRCT2 (roller coaster tycoon).
It would be great if someone out there could start such an initiative with SWAT3. I know it's not strictly legal, although it is unlikely anyone would care at this point and I would totally do it myself if I knew how. The fact that people are able to do it with these other games, proves that it is completely possible. There's been some discussion with CC about using the Ghirda tool to do such a thing, although none of us have been able to get it working due to its weird Java dependency.