Want to install UB last - will this be a problem?

I have SCS, bgtweaks, atweaks, and a few other small mods installed, though I only have a few components from each installed, the largest changes are definitely SCS though. I want to add the Murder of Acton Balthis component of Unfinished Business to my installation, but don't really want to have to reinstall everything again. Can I just add it last or will it cause problems?