I doubt you would snap a chassis. Obviously not concrete proof, but I've only heard of 1 person breaking a chassis. (see 2wdrc.com for the post if you want to find it)
the front end is basically all B4 anyway. Apart from the nose piece. X-factory redesigned it a while back and the newer ones never seem to break. I've not broken a new one and it's been on 6 months at least
I've broken the odd rear arm, but not for a long time now either.
Rear wings are what I use the most of.
It's very rare I need to do anything but change the batteries between rounds now
Lesro, DMS and any associated LHS will be able to supply replacement parts