The Campaign was created using ADiKtEd, which took me a few months.
As for the Land view image that was just a random image I googled, then edited in Photoshop. The Land view was the easiest to create, as it only took about an hour to make.
However, Mefistotelis is the one we have to thank for incorporating it into KeeperFX.
I've also produced some mentor script quotes for each level. But this is to be added at a later date.