I've seen this, and it's interesting, but very hard to set up.
If you wanna stick a USB into your PC and use it as a dongle, it's far from that.
I bought what i thought was a cheap RNode dongle, but ive since had to buy extra shit since the firmware on it is some proprietary chinkshit that only allows intercommunication between that specific board, not reticulum.
I've yet to complete the project, but seeing how inactive nomadnet is, and how the maximum reach with it is like 2 kilometers at kilobytes per hour, i wish there were more legal ways to go about it.