At the present state, I've managed to compile system.img and halium-boot.img for my phone, Redmi Note 2 (Hermes). With the files, I was able to install and boot into ssh, while it remained stuck at the logo but as it uses mediatek wifi, the process to get it up, is a bit complicated.
What I've learnt from a little probing; I'm able to echo 1 > /dev/wmtWifi/ but I'm not sure how to echo "sta" and I can't find a wlan.ko but I found some patches for mt6630_*.bin in vendor/etc/firmware, but I can't write into the rootfs, despite turning on the rw mode ( mount -o remount, rw /) and chmod +x. So I'm at a loss here.
If there's any pro in the house, I could use some help.