I don't do a lot of narrowband but thought this area may be worth it.
It was handy to image it as I did it along with M78 which set "early" (2:30am) and I had a few hours left each night to image something. Vela is near its peak at 2:30am now so I imaged it again.
TEC180FL, Apogee U16M -10C (it was hot weather), Astrodon 5nm Ha O111 and S11 filters.
S11 Ha O111 90 60 45.
http://www.pbase.com/gregbradley/image/108942571
Greg.