ultramodded theory

I'm trying to make an ultramodded server for my friends, but you all don't support multiple mods. However, I have a theory that if I tell all my friends exactly what mods to get, then it might work out as an ultramodded server (modding our personal games instead of the server). My only concern is if the things we do in the mods will be saved when the world comes back. Does anyone know what might happen. I'm going to test it out and probably report back on what I got, but I wanted to get input from here.

I'll see what works and what dosen't just thought i'd get some input from others