Looks awsome. It really is a point of great shame for me that mine's still waiting to be built up. Good to know the Big ones fit, I was thinking of using them, interested to see how they last out. Shame it looks like there's no space left for fenders too.
Just do it! Fenders would most likely interfere with the seat tube. Better to go for 2" or something like that. I had Thunder Burts on before this and I think they would work. Big Ones are lovely! Fast and of course, very comfy. No idea on longevity thou...
Very pleased with my Vagabond so far. Did a 200km gravel randonné a couple of weeks ago. Big ones did really well on both gravel and tarmac. Picture is from this weekend's camping. Frame bag should land tomorrow, then I think I can ditch the rack on shorter outings.