Why don't you try looking at the files for PACrom as they use those. There isn't an official one for the nexus 5 yet but I'm sure you can look an the Nexus 4's ROM files.
Sent from my Nexus 5 using Tapatalk
Device: LG G2 (LG-LS980)
ROM: Nameless ROM
Recovery: TWRP 220.127.116.11
If I've helped you, please hit thanks!