After i downloaded and extracted the files from the .rar and put it in the "mods" section of besiege data, it did not load properly and did not have the icons on the bottom of the screen.(when i was playing )
1. it seems that you are using a older version of it, afaik the latest version as of now is 10.1, so that might be it.
2. this might be because your version is older, but it looks like your folders are in the wrong place, there should be only the BesiegeCustomScene folder and the .dll in the mods folder.
3. you might be missing the file for the maps (EN.txt). it should be in the UI folder inside the BesiegeCustomScene folder, but if you don't have it, I have attached it.