Hey Bud, I just got the exact same version of the nuc working. Ds918+ with the 1.04b loader.
I've uploaded everything you need to get it working.
https://mega.nz/folder/GmYnTAQD#lq4-alTFrG-aVgVD00CdMA
Just make sure you change the VID and PID and the MAC from my uploaded synology img.
Read that guide. Front and back.
Disable bluetooth, wifi before you start from the bios. It will take forever for the first boot and you'll need to mess with the settings to set up so it auto boots to usb.