Here is the video that the Doug Chiang quote is from...
http://www.youtube.com/watch?v=Gx7YSByPI8I
Interesting to note that even the fully finished, detailed and signed-off minature of the Naboo Starfighter in this video is to the correct scale and correct from a technical perspective (Plenty of Space for R2 etc).
I wonder did the set designers f*ck up the scale of the ships and/or the Naboo Hanger set meaning that they were stuck with the botched design when it came to rendering the CGI versions. Or was it a cost factor that they couldn't afford to build them to the correct scale as Doug had designed. The first scenario seems the most likely to me.
And the quote is hardly damning. He just imagined the X-Wings looking different in his personnal opinion. Also, he says that he was initially designing the ships for TPM to look like OT/McQuarrie ships but George told him not too.
I think the new Trilogy will be just fine in his hands.