Bingowings said:

I've been thinking about the reactor in the bunker thing.

It is a bit crap really (perfectly in line with the Imperial policy of making weak points in their plan obvious but still a bit crap).

What if the view was replaced to a balcony overlooking the base proper (it is just a back door and we know there are lots of buildings there).

The Rebels could go down the bunker tunnel but end up in an observation area high in the cliff overlooking the base buildings as seen next to the landing pad.

Or a hanger for ground vehicles and bombers which also stores munitions thus making the Rebels boom go a little further.

I like the way you're thinking. But if its up on a cliff, you would only be able to see the sky from the angles we see, so that's not very exciting. A ground hanger would look awesome, but would really be redundant since all of the ships they need would be housed in the DS2 and they'll probably just blow everything up when they leave after completion anyway.

I wish we could keep the current "small building" idea, but explain why EVERYTHING explodes from the couple charges they plant.... Of course, we don't want to explain too much, or we'll be treading into Prequel Lucas territory:

"Look over there! Planing the bomb over there will overload the whatits and blow this whole valley up!"