Here's a shot showing the view screen wall we saw in Space Seed
(and The Menagerie's
courtroom scenes). I've also got the table in there (library computer terminal and tri-viewer coming soon). Please note that the table's orientation and position is not final.
The viewscreen itself is canon, but the walls surrounding it are a little different than what we saw in Space Seed
. I've made it a bit more symmetrical, and had to adjust it's length due to the season 2/3 version of the briefing room being 2 feet longer.
I believe the viewscreen was modified and moved to the Auxiliary Control Room set beginning at season 2, so, as far as I know, we don't see this wall as part of the briefing room past season 1 (unless anyone knows otherwise).
 Just noticed that the screenshot function of the game engine did not pick up the reflection I added to the table. Bah!