Question on Doom 3 Modding Thread

I would like to make a map but I'm unsure if I'm going to be able to do it. I want to make a map similar to Mars City, the beginning of Doom 3 when everyone is still alive. I would like to incorporate the Allied Marine Squadmates mod where during the entire map or maps not only will you get to see pre-UAC at work but not be alone in its invasion.

If anyone knows a way that this can be done please just send me a message.

How do you instal these mods from this website?