After another long mapping break, I decided to map Ultima VIII: Pagan. This time was actually quite easy, as I was able to use a hidden feature in the Pentagram project for this purpose. For reference, it is the console command
GameMapGump::dumpMap. Combined with the map list reference included in the source and the command MainActor::Teleport, I was able to fairly easily generate maps for this game.
So, to be perfectly clear, I only generated, catalogued and uploaded these images. The Pentagram project deserves all the credit for interpreting the Ultima 8 data format and implementing the actual map generation feature in the first place!