Now, when I played
BFG many many years ago I only really had Tyranid ships, and only played against Imperial and Chaos. I currently have some Dark Eldar cruisers and frigates but I have no clue how big the Necron ships are because I've never actually seen them.
I have recently bought a small FSA Relthoza fleet though. While the battleship is very large the Theridon carrier is substantially smaller. It would probably fit better as a
BFG battleship/tombship.
I can measure it, the new cruiser/hvy cruisers, and the current escorts when I get home and somebody else may be able to say how the Necron ships compare.
Automatically Appended Next Post: The newest Relthoza carrier, I'm not sure if it's the Theridon or the Hive is 3" wide and 3" long. It has side wings which are 2.5" tall but the body is about .5" thick.
The battleship is 2.5" wide and 5" long, and just over 4" tall. Although you could mount it on its side so that it would be 4" wide and 5" long.
The new Relthoza cruisers are 1.5" wide, and 1.75" from front to back and about 3" tall, although again it would look good on its side if you want a really wide ship.
Those are the ships found in these two boxes, because those are the only ones I have.
http://shop.spartangames.co.uk/ProductDetails.asp?ProductCode=FATR12
http://shop.spartangames.co.uk/ProductDetails.asp?ProductCode=FATR13