http://stardestroyer.net/tlc/Power/index.htmlWhile it is about the characteristics and firepower of turbolasers, about halfway through the page they take measurements on the Falcon. Leaving out the pictures, I'll quote it here:
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Curtis Saxton finds that the twin globes on top of ISD bridge towers are ~43 meters in diameter. In this image, the Falcon is attached to the stern portion of one of these towers. The globe is 92 pixels in diameter. The Falcon is 93 pixels wide and 114 pixels long. By these measurements, the Falcon is ~43.5 meters wide and ~53.2 meters long.
(later in the page) Some would argue that the Falcon is only 26.7 meters long, as West End Games sourcebooks state.
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Note that West End Games is not canon, and Curtis Saxton wrote the Incredible Cross Sections, the only Star Wars tech manual to ever be considered canon, and also had backstage blueprints and views of the original models. And he is a theoretical astrophysicist. So I'll go with Saxton over West End Games, thank you very much.
As for Leia looking like a breen, as stated above, ROTJ was years before the breen were ever introduced.
As for hyperdrive vs warp speeds,
The warp speed table is as follows (taken from the TNG TM and the Star Trek Encyclopedia):
Warp Factor
Speed in multiples of c
1
1
2
10
3
39
4
102
5
214
6
392
7
656
8
1024
9
1516
9.6
1909
9.9
3053
9.99
7912
9.9997
200,000
Warp 9.9, the max speed of the Enterprise-D, is 3,053 times faster than lightspeed.
For SW speeds, one of the best articles is found here:
http://stardestroyer.net/Empire/Tech/Propulsion/Propulsion2.html(Sorry for using SD.net, but I find it very informative)
The Rebel Fleet apparently moved at a speed of 3.5 million times lightspeed, and these were REBEL ships, not exactly high tech well maintained imperial military hardware, and likely going at the speed of the slowest ship in the fleet.
The Millenium Falcon has been estimated to move at about 50 million times lightspeed (which is why it is called the fastest ship in the galaxy). Notice they went from Tatooine (outer rim) to Alderaan (in the Core) in a few hours.