Nice.. I did same thing or almost yesterday to my sup exf,, used hope fortus 35 with pro 5 hub so it became five mm wider and a fox float grip fit 36 WITH 160 MM Travel which is 20mm more than it had,, I also gon change the rear damper from rs to Marzocchi which has five mm more travel igot no f idea how much difference it will make on the wheel hopefully I'm not going to bottom it out but I'll guess it will be a couple of inches more travel hopefully it's ok I already checked that the frame can do it space wise and I went for a fizik seat.. I already have a deal with the store they gonna fix the speed so it won't be slower with the smaller rear wheel it cuts way too early now.. Anyways your bike looks super good it's unlimited what you can do with that upgrade wise you already have a long damper etc I see you have bontrager rear wheel i guess that's trek inhouse rim brand so it makes sense on a trek build.. I also changed stem and bar went for dmr 35 stem with gusset 35 bar with 50 mm rise it's super comfy when you are two meter long like me. I basically made the bike taller in the front and lower in the rear with deeper travel making it keep being slack down the travel while still having a decent height on the bar while the fork compress.. I'm about to change the front wheel to in fortus35 29" to fit the rear fortus 35 29"wheel mostly for the looks but it's also both lighter and wider and it's super cheap at the moment. It's still not as nice as your bike but hopefully it's going to be almost as trail friendly when it's done. Yours is sick and send ready