Implementing lightning over Meshtastic is unlikely as each transaction has to be updated in the graph of channel balances, needing an internet link somewhere. 

Ecash however is perfect for Meshtastic since it’s more akin to transferring a static file like a pdf. Then the receiver can “redeem” the ecash token if they choose. 

So in short, no. But we’re getting close.   

 We'll make it eventually... @BitcoinJungle is on board with #meshing