Just some general answers to start with that can certainly be experimented with: These answers pertain to the CIV III/Conquests Game What are the maximum run times of a unit’s animation and audio files? In general, the game uses 1 to 2 seconds depending on the Unit Action. You can use Attack A, Attack B and Attack C for one long Attack by splitting the Animation into 3 parts that will play through all continuously without hesitations until the Unit Wins or Dies. I used this technique for my Unit The Drunk. You could set one of the 3 Attacks as no sound if you want a hesitation, etc... Because the Fortify plays just before the Attack, the Fortify is generally the Fastest Animation and Sound. Depending on what you are wanting to do with Animations and Sounds, it will require Testing to see what can be done with the Animations and Sounds for Units. What is the maximum area that a unit can occupy? Using Flicster and Civ3FlicEdit, 240 x 240 Frame is the largest frame size used for Units but I am not sure that a different program could be used to make larger Frame Sizes that could work in game. The 240 x 240 frame size is probably used as the largest size due to the size of the Game Tiles and space concerning Unit interactions when attacking/defending on the map. Could I simply package a custom soundtrack in to one large MP3 file and use it to replace the existing music? Not sure all music can be placed in one long MP3 file for playback but each music MP3 file can be placed in the Sounds-Build-Misc folder separately. Make a music.txt file and place the Names of each MP3 Music in the order of desired play sequence. That text file is placed in the Text Folder. You might talk to Kyriskos as he has worked on making some different Games other than CIVIII/Conquests.