That is a terrific idea, I would look really forward to a nice model of the Comet. There is a good 3 view drawing on this site:
http://richard.ferriere.free.fr/3vues/3vues.html#d
which I believe is in the public domain.
At the below site, you can see photo's of the Nimrod, which at least has the same wing and engines as the Comet.
http://www.primeportal.net/the_airstrip.htm
Note, however, that the engine intakes were modified to take by-pass jet engines, and are therefore somewhat larger than the previous models.
It will be nice to have some more civil airliners in the forum. I'll folloe your progress with interest, good luck!
Scon10