If it's any help for anyone, from the WoWRPG book:
Night Elf: Female = 174 - 318 lb | Male = 184 - 324 lb
I have all the base races and High Elf and if I find the right box I also have Draenei, Worgen, Pandaren and Goblin. (Other Elf variants use the High Elf chart).
If anyone wants me to put up the basic bits from the 3 editions of the RPG, I can. They are surprisingly interesting.