I'm building something a bit similar (slowly) and have been looking at options. My frame is 120mm spaced but it is steel so could be cold-set to 130 easily enough. I've been weighing up the options and from what I've learnt the pros of using a road hub and a SS conversion kit for sscx are...
lighter weight (no bolts)
quick and easy cog changes with just a cassette tool
you can run a couple of cogs
you can use a QR
you can borrow a spare wheel at a race
freehubs are generally much better sealed than screw-on freewheels and tend to last longer. Even WI freewheels tend to last months rather than years off road according to my mtb mates (who are probably just doing it wrong).
I'm building something a bit similar (slowly) and have been looking at options. My frame is 120mm spaced but it is steel so could be cold-set to 130 easily enough. I've been weighing up the options and from what I've learnt the pros of using a road hub and a SS conversion kit for sscx are...
The negatives are...
Sick frame BTW.