I think it was your facebook post that I saw & commented on yesterday Andy.
I’d strongly recommend you get a 160mm Pike in 27.5, even if you’re planning on running a 26″ wheel in the front for a while. (Up-size just the wheel later, rather than wheel and fork)
160mm Pike is perfect for this bike. It’s certainly not “too much”. Whilst I’ve only ever run the 160 plates, your 140 plates shouldn’t change the geometry much (only the leverage ratio changes).
I’ve tried both 26″ and 27.5″ wheels on the back. I prefer 26″ as it provides better clearance.
1×11 XT build with a N/W ring will offer enough security. The SCS chain device is good but probably overkill with N/W.
They’re a nice long frame, so you can get away with a shorter stem than on a Five. (I went from a 20″ Five to an XL 301). Had 50mm stem on Five, now 30mm stem on 301.
The Syntace rockguard mech protector is worth fitting. It offers good impact protection.
301 downtube is thin. A rockguardz might be a good investment. Haven’t yet bought one and I have a few small dents down there.