Thanks all, much appreciated!
Already have a Cross-check, but it's two sizes too big to be any good on the trails. I got it as a relaxed child-carrying bike so it's loaded with child seats and big back swept bars.
As i'd need basically everything part from the frame, I think it'd be cheaper to just get something second hand. Alternatively build something up based on a on-one inbred... choices choices choices
Anyone got a karate monkey or krampus for sale... :)