Debian 13, build v0.28.0 Steps: 0.   +  Install Dependencies from BuildInstructions sudo apt install build-essential cargo cmake curl libboost-dev libboost-system-dev   \   libboost-filesystem-dev libcurl4-gnutls-dev libenet-dev libfmt-dev   \   libfreetype-dev m4 libgloox-dev libicu-dev libminiupnpc-dev libnvtt-dev   \   libogg-dev libopenal-dev libpng-dev libsdl2-dev libsodium-dev libvorbis-dev   \   libwxgtk3.2-dev libxml2-dev llvm python3 rustc subversion zlib1g-dev cargo install --locked cbindgen@0.29.0 1.     git clone --branch v0.28.0 https://gitea.wildfiregames.com/0ad/0ad.git 2.    libraries/build-source-libs.sh --with-system-mozjs     3.   ./update-workspaces.sh --with-system-mozjs           Premake version: 0.28.0           Requires Premake 5.0.0-beta5 or later Premake compiled, but libraries/source/premake-core/premake-core-5.0.0-beta7/build/bootstrap/Premake5.make specifies the version as -DPREMAKE_VERSION=“0.28.0” instead of “5.0.0-beta7”.  

I have found some of the guides, but they are incomplete or scattered, I mean, it is not as clear as I would wish. For example, I could not find any guide on GUI modification, the only guide I found was about creating an unit and I want to create complete factions. Thank you for that, it will be very useful.

Just in case, it seems the colours are flipped here? On the left, "command" is red (as I guess would be more appropriate), while on the right it's reversed:   For a description on this stuff, Xenophon's Cyropaedia is a nice resource. Just a quote for a Xerxes idea: "purple tunic shot with white (no one but the king may wear such a one)". Regarding other preferred colours: "he had had a great many made, with no stint of purple or sable or red or scarlet or crimson cloaks. He apportioned to each one of his officers his proper share of them".

If it isn't running on the simulation thread, and if it would be using currently unused processing, then it is probably fine

@Eilat I recommend you to have a look at the game Earth 2150. It's near futuristic war and the way it deals with supplies is great, the best I've seen yet never found it in another game. Size of maps shouldn't be an issue if you concentrate on particular missions as part of a larger campaign map, for which there are also projects around.