I made this, keeps the lower link and derailleur fairly clean, it will pack up if you ride through snow, but other than that its been problem free.
I took a SKS shockboard front fender and cut it to the shape of the rear triangle on my Intense 5.5. Then I drilled wholes in it and zip tied it to the rear triangle where you have your mud guard. It was only marginally effective. It did keep some of the mud and water off the FD and pivots but when things got really muddy the mud would come over the top and slide down the seat tube. I guess it did a fair job of keeping the big chunks of the lower links. Since moving to Colorado its a non-issue since we have 300 days of sun as compared to the 170+ of rain in Germany where I was before. My Nomad hasn't even seen a muddy ride yet. I honestly miss the mud sometimes. It might mean I am a little crazy.
Narrow is the path to life, few are those who find it.