That does look like a lot of fun!
I wouldn't want to break a spoke with that little clearance though! :-O
I'm experimenting with using 700c/54mm front tire for the rough stuff (different bike). Yeah, its a lot like old school ridged mountain biking or a ridged 29er - just faster on the wide open stretches or when biking to the trail head.
+1 jealous of the green paint job.