Check out the CB-B5ism mod variant for one way to get a good atmosphere and a fair, playable game.
As far as ancients go, what about simply having a racial trait which reduces reproduction to zero?
Spend all the racial points you get from that on tech-boosting traits instead, and hey, you look like an ancient now.
PS:
I really hope you're not going to have a racial trait called "Minbari" as part of your scheme... that's really iron-fisty.
Quote:
The more space a vessel has, the exponential more engines does it require.
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Unless the exponent is 1.0 (IE linear increase in requirements), it is not QNP. A ship twice as massive should require exactly twice as many engines to perform the same.
As far as armor...
You'll need the SE4 damage mechanics to get the leaky armor you want.
In SE5, you have a choice between percentage based leaky (Always the same fraction leaks through, no randomness) or directional armor (distribute armor to the front, back, left and right)