Got my rack, and have used it a few times. It is the new version of the OMM Sherpa, and is really solid! I bolted it with stainless steel allen bolts to the frame where it was tapped for racks - worked like a charm! Distributing the weight between the handlebar harness and the rack works out really well. Still have to try with a full load, but sure it will be fine!
Here it is with the camping set up (overkill for the 1.5kg I had on it!)
Here it is with the packrafting kit:
