Does anybody have any, or know where I could find, some refrence material on the SHIELD hellicarrier?

Try this:

http://www.tjpearce.com/thelastgriffon/SHIELD.pdf

I don't know what was in that link because it takes forever for me to download pics in pdf, but if you can get a copy of The Official Handbook of the Marvel Universe (from the 80's) there's a pretty good "bird's eye view" drawing of it there (listed under S.H.I.E.L.D.).

I spent a few hours trying to make this 2D map myself but gave up on it. The Helicarrier has a lot of funny angles that won't fit the grid & would only start arguements in play.

Good luck!