^I liked your briefing room, but honestly, I didn't have a problem with the original. The thing is, to me, it didn't have to look like the 'slapped together' places they'd used before so much because a lot of time had passed since the destruction of the first Death Star (meaning, uh...time to organize? New, richer allies?), and the fact that it's a big Mon Cal capital ship. I did like your mock-up of a darkened briefing room, but I liked the lit up one, too.
One thing that was quite cool about yours was the feeling of grandeur of the set. Very nice! The whole thing felt bigger and more important, so to speak. And using those mattes from The Black Hole was a nice touch. That movie really had some beautiful art design in it. :) I watched it recently for the first time in many years and I was impressed by a lot of it.