Oh this one's MUCH cheaper - a bargain at a mere £3,094.03 [bigsad] (evidently it pays to be specific)
AFN Defender 130 Double Cab Aluminium Hard-top - Devon 4x4 - 6009-AFN
The AFN website shows various 130 'hard tops' available Hard-tops for Land Rover Defender 130 double cab TDI/TD5
They do both types - 'normal' and barn door. I
I've gone off the barn door idea... tailgate is a convenient place to sit / cook / butcher / whatever.
(would be more expensive to fabricate as well)

