Re: Fat Bike/ Friction set up / Ideas?
I'm looking at your bike BigPine, and I see no reason a rack mount chain drive wouldn't work on your bike. Something like my build but with the engine style in Pauls build would get you going with minimum fab work. Your rear wheel looks perfect for a ragjoint. Don't let anyone tell you ragjoints are unreliable...they just need to be installed properly. I have never had a single failure or issue with the sprocket on any of my 20-25 builds to date.
If you have the funds, a Staton or ThatsDax rack mount should bolt right on with minimal mods. Several engine choices available.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.