Well, it's has an Intel Core i7 and an Intel Chipset, so, as expected, it boots the El Capitan installer fine, and boots later to the desktop fine, provided that the proper minimal kexts are used, and the Clover configuration is right.
I'm at the optimizing phase. There are quite a few thing that have to be done. Rehabman graciously provided all the guides for that.
Things that don't work so far:
-the M.2 NGFF Intel AC 7265 wireless card. Intel wireless cards have never worked in OS X, ever. I replaced it with the overwhelmingly recommended Dell DW1560 NGFF wireless card, based on the Broadcom BCM4352Z chipset. Rehabman provides the kext and the Clover configuration to get 2.4 GHz and 5 GHz, bluetooth and handoff working.
-The Elan trackpad. Unfortunately, it doesn't use the standard PS2 interface, but a newer i2c interface. None of the trackpad kexts work: VoodooPS2Controller, ApplePS2Elantrackpad and ApplePS2SmartTouchpad. None of those work. You have to use a USB mouse for the time being. The keyboard works with VoodooPS2Controller, though.
I haven't tried activating yet the audio, the webcam, the backlight, power management, QE/CI graphics and 4K support.