Changing personal rift's appearance

Hi! I’ve been looking for a mod that changes the personal rift’s appearance to a more classic portal appearance, like Reign of Terror does. It does not seem to exist outside of RoT though, so I thought maybe I’d create one myself. Would it be possible to take the portal from Reign of Terror and make it into a standalone mod?

Yes, it’s possible. You’d have to dig through the ROT files (after unpacking it) to find the relevant portal files and extract them to a new mod.

I’m a super beginner. What tools would I need to do that?