Just the exterior, lol. I had a little too much free time on my hands a while back and wanted to go all out, so I used 3-D printed parts from files obtained from Leonardo (Ed Straeker) to do that. It's not screen accurate at all, but is based on what a TK helmet would look like if it were "real", so to speak as seen in the cutaway image (below) that it is based on. I took a bit of artistic license with it.
Hint: When building your helmet, it really helps to look at some of the approved Centurion submission threads in the Advanced Tactics area to see what we are looking for, as well as common issues that need to be corrected. When in doubt, always ask before moving ahead.