I just wish ML could get a good, solid page set up in one spot, to tell you everything, step by step to set up and use the video RAW from the ML set up, to export for use by Davinci Resolve (which as of 9.15 version will take the RAW straight in)....
I've read through hundreds of pages of the forums, and as soon as I read one instruction set...that seems comprehensive, I read 2-3 more posts down, and someone says it blows up, and that you now have to get build #37 from server xyz, follow half the directions from post #222 from a month ago, and then download and replace this one file on the camera to get it to work....do the hokey pokey....etc.
It seems they are SOOOO close on the 5D3 to being more ready for primetime or at least an easier to install and use Beta version, I wish they'd concentrate on that, get that out the door for the masses to more easily use, and then concentrate on the other cameras that are next closer to being ready.
Then again...I'd like a pony.
Finding out how to install the last version of ML on the 5D MKIII it's actually still quite hard.
Here is the last Alpha build:https://bitbucket.org/hudson/magic-lantern/downloads
And here are the last updates:https://drive.google.com/folderview?id=0B7QlH_BH2m32SnFObTh1dE1PNjQ&usp=sharing
To record RAW, you just have to activate "RAW Video" from the menu. From the same menu, you can change the settings. It's all very easy, if you've already used ML firmware. The only issue with ML in the MKIII is that, for safety resons, there's still no autoboot, so you have to boot the firmware everytime you turn on the camera. Apart from that, everything works fine even at 1920x1080 24fps.
As you wrote, Resolve can handle ML RAW, so there's no problem. On the other hand, if you prefere to create a proxy file, you ca use Rawanizer (freeware).
You can also extract the DNG's from the RAW files (with raw2dng, also freeware) open the DNG's with Camera RAW or something like that, make the adjustments you want on the first image, apply the adjustments on all the others DNG's, export everything in the format you prefere (I use TIFF) and import everything in Resolve for the final color grading.