I guess i used the base binary method. I'm not real sure if it matters or not.
But I will warn that I didn't get my build working 100% right away, as I didn't follow the directions exactly. I took short cuts that overall didn't work. So I kept going through all the steps exactly, and finally got through successfully.
Here is the method for the making the install media that I used that worked for me:
mkdir /tmp/install_esd
hdiutil attach "/Applications/Install macOS Sierra.app/Contents/SharedSupport/InstallESD.dmg" -readonly -mountpoint /tmp/install_esd -nobrowse
sudo asr restore -source /tmp/install_esd/BaseSystem.dmg -target /Volumes/install_osx -erase -format HFS+ -noprompt
diskutil rename "OS X Base System" install_osx
rm /Volumes/install_osx/System/Installation/Packages
cp -a /tmp/install_esd/Packages /Volumes/install_osx/System/Installation
cp -a /tmp/install_esd/BaseSystem.dmg /tmp/install_esd/BaseSystem.chunklist /Volumes/install_osx
hdiutil detach /tmp/install_esd
rmdir /tmp/install_esd
Replace the config.plist in the USB's CLOVER directory with the one located in the repository's INSTALLATION directory
Here is another thread that I also got useful info from.
https://www.tonymacx86.com/threads/dell-precision-m3800-2015-edition.159493/page-2
https://github.com/AustinSMU/PRECISION-M3800-OSX
Be warned the AustinSMU method didn't work well for me. But there is useful info in there.
One more tip is that the DVMT Pre-Allocated Memory for this "The_Dark_Void" repo is 160mb, not 128mb.
It has been updated in the git, but not in this thread.
Also I don't think just downloading the zip of the git repo will work well either.
So I would use the "git clone
https://github.com/the-darkvoid/XPS9530-OSX.git" like it says in the thread.
And here is "The_Dark_Void"'s original thread for the yosemite, which also has helpful info.
But this ElCapitan thread is what I got my Sierra 10.12.6 working with.
If you don't have any luck, I could post the exact steps I used to get my M3800 working.
Which was all tips pulled from throughout this thread.
Good Luck!