[Slyk]

1. you need to have Spearhead installed
2. mortars are can be found by 'right-clicking' and looking in the 'addon' section, german, turretweapons,... I think. You'll only see a big black box though in Radiant. You generally need to sink the box 8 to 16 units below the terrain to have it line up right....takes some adjusting, don't remember specifics.
3. If you want to mod the range of the mortar you need to edit the tiki file 'gravity' setting. It's something like 1.5 now... I found that .5 to .7 is pretty good for decent range...although it shoots longer meaning that even the minimum range increases. But I always thought the 1.5 made it virtually useless.
4. IF you mod the tiki file, be sure your sky box is TALL or the shells disappear into the top.