Had some time up my sleeve on early Saturday morning while camping in Eumungerie, NSW. Ended up with 33x300s at ISO400 so as you can imaging, the core of M42 is pretty well blown out! I'll have to fix that in the coming weeks when I can get some 60s and 20s bits.
Processing so far as been stacking, colour calibration and a basic histogram stretch. I plan on getting a fair bit more exposure before I'm done
High Res on Astrobin