Well after some curious thinking and prompting from Phil Moore, I took the plunge. With cycling for me if it has two wheels, no engine and a chain I am interested, if it has off-road tyres, I am more interested.
So it didn't really take too much prompting, before I got hold of a FiveT CX frame made by Kinesis and started to the build from my spares box, a couple of spares from friends and donor road bike.
The result is a 1x10 block, skinny tyred little beast pictured below:
Ready to race, even if the current forks are a little flexible, I just won't brake. Yet to be tested in anger, but so far it has delivered what I expected.
Thanks to Jon for the shifters.
Phil for the fork loan and prompting.
The lads at Cycleworks Guildford for the fine tuning and new rear mech.