I understand your reasoning, and I have that book, actually. The issue is what kind of Lego scale you're building in. I build by height, and in that scale my gunship is about right. Lego, on the other hand, was building by the width of a minifig, in which case their scale would be correct.
I have the first one. but I changed a lot of it because I didn't like it. It didn't hold together well(I have it posted) I didn't like the new one because it was based off of the garbage clone wars crap that I think someone put george lucas on drugs to get him to make. yours does seem very well done though.
I didn't actually scale down the official set, though I did use some of the same techniques. I based this on the Episode Two gunship, rather than the one in the new movie (but I couldn't build the ballguns).
I think that the new gunship is scale accurate to the new movie, but this is more scale accurate to the Episode Two version.