@stan101 asked me to provide a straightforward walkthrough of ML for the 70D to get him started. I promised a Youtube vid explaining my process and settings, but I'm a little squeezed for time this week so I'll provide a bullet-point form response until I can get to filming a tutorial:
Q: What version of ML do you run on your 70D?
A: I use Magic Lantern Nightly.2019Mar07.70D112 (02e5918a6ed5+ (crop_rec_4k_mlv_lite_snd)) Built on 2019-03-07 20:10:24 UTC by artur@Artur-VirtualBox.
This is ArcziPL's build discussed here. Download here.
Q: What settings do you use on your 70D?
A: I aim for the highest visual quality I can attain, sometimes at the cost of recording time.
Following are my Canon/70D settings accessed via the 'Menu' button:
Movie1 ->
AF method: Face+Tracking
Movie Servo AF: Enable
Movie2 ->
Grid display: Off
Movie rec. size: 1920/24/All-I
Digital zoom: Disable
Sound recording ->
Sound rec.: Manual
Rec. level: a few ticks past zero.
(I use an external microphone setup that has its own amplifier, so I set the internal amp as low as possible. If you're using your camera's internal mic, just set Sound Rec: Auto)
Below are my ML settings accessed via the 'Trash Can' button:
ML -> Modules ->
crop_rec: OK
mlv_lite: OK
mlv_snd: OK
All other modules are disabled.
These three modules must be enabled before the below settings can be worked on.
ML -> Movie -> RAW video ->
Resolution: 1832x1024
Aspect Ratio: 16:9
Data format: 14-bit lossless
Sound Recording -> Enable Sound: On, Sampling Rate: 48 Khz
All others are left at ML defaults.
ML -> Overlay ->
Global Draw: OFF
ML -> Expo ->
White Balance: Auto
ISO: 100 (As another poster mentions, anything below 640 works well.)
Shutter: 1/48.19, 179* (Following the 180 degree shutter angle rule for creamier motion blur)
Aperture: whatever your lens supports
Picture Style: Cinestyle (I've downloaded the Cinestyle profile for the 70D and installed it as User)
All other left at ML defaults.
Q: How much recording time can I expect from this?
A: It depends on the complexity of the scene, but anywhere from 30 seconds to 5 minutes. The camera pushes to the SD card at 40-40.5 MBps at these settings. This is at the threshold of what the camera can handle.
Q: I need continuous recording. What settings should I use?
A: Drop your ML -> Movie -> RAW Video -> Data Format down to 12-bit lossless. This reliably writes to the SD card at 35-39 MBps, which provides unlimited/continuous shooting.
Q: I *really* need to shoot at 14-bit and want continuous recording. What settings should I use?
A: ML -> Movie -> Raw Video -> Aspect Ratio: 2.20:1 provides a resolution of 1832x832. You will get continuous shooting at 39MBps at 14-bit.
Q: What SD card do you use?
A: I use a SanDisk Extreme Pro 128GB U3/V30 170MB/s card. This card can write at 95 MB/s, which is overkill for the 70D, but it gives me an upgrade path if I decide to get a faster camera.
Q: What speed does the 70D write to the SD card at?
A: The maximum possible speed is 40MB/s. Anything above this will run the camera out of buffer within a few seconds.
Q: My ML menu screen flickers every few seconds. Why?
A: I have no idea. Mine does too.
Q: What program do you use to convert MLVs to another format?
A: MLV App.
Hope that helps @stan101! A Youtube tutorial is forthcoming in a week or two.
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, had some personal thinks to take care of , that was more important then magic lantern . 
Hope things smooth out on your end. I just had a glance at the thread, and the code is surprisingly readable. I'm happy to test any lossless (or otherwise) builds when things get to that stage. Also happy to help out coding - I'm a C++/C# coder, so it'll just take me some time to catch up on the ML data structures and layout. If you've got a suggestion on where to start reading, I'm all ears!