I can smell Your Extravaganza
http://www.games-workshop.com/MEDIA_CustomProductCatalog/m1830009a_99120112015_RazorwingSprue01_873x627.jpg
http://www.games-workshop.com/MEDIA_CustomProductCatalog/m1830014a_99120112015_RazorwingSprue02_873x627.jpg
If I may guess from pictures of sprues, it's 24,01 times wider than pilot ribcage (right top corner of first sprue, measured without shoulder pads) and 21,67 times longer. This give about... multiply by 8mm...
19,002 cm wide and 17,336 long (from "fork" to end of horisontal wings)
hmm... good to know... I plan to "Extra" few from beefed up Bladewings.