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Retro Gamer Magazine had an extensive article on the games development, with interviews with devs, screenshots taken from the various versions etc. Tracking that article down be the tricky bit.
Snap! I just came here to post about the newly released (released today) Duke Nukem Restoration First Slice 1.0 . This is the first release of a project to convert the released 2001 source code of Duke Nukem Forever to a full and final game...
Whilst not build engine specifically, a month or so ago saw the release of "The Force Engine". This is a reverse engineered source port for Star Wars: Dark Forces...
Now that's a project to watch. I'll wait for the final release, but that's definitely worth a play.