Creating multiple goods factories that require raw materials which can be changed depending on what is being made.Reducing all cargo capacities to 1(a boolean would work for better memory useage).Some of the major things I would need to change. How would I got about doing this? Make newgrf files using NML? I have done a few ports of trucks and trains using the NML system. I have access to all of the assets from that game through Corell draw (to open a wierd file format) and a Windows XP emulator. I want to create a complete conversion mod of Openttd to turn it into one of my favorite old games, Industrial Giant.