Cheers for all the comments foks, I am pleased with the outcome. It's not amazing light, around 26lb on my suitcase scales, but it's still nice and quick on the trails. I'm still playing round with stem length, 90mm was too short and put my weight too far over the back of the bike, I've got a 120mm on it now which feel better that the 90mm but I want to try something in between next.
The only real problem the frame has is with tyre clearence, the 2.1s that are on it are very close to the inside of the chainstays so it wouldn't be very good in the mud without skinny tyres.
Handling wise, it's good too. Only starts to struggle on the really rough stuff at high speed due to the lack of fork travel. But this isn't much different to my 100mm forked bikes. I've been riding my on one C456 quite a bit lately and you kind of get used to plowing though stuff with a 150mm fork on the bike
I don't see any issue about the parts being modern, it's just that they're black and this frame colour needs silver parts. This is the case with many Konas of that time. They were designed to look good with silver parts, not black, so it's no surprise that some of them don't look right with black.
Interesting statements this considering the original crank was balck, rear mech was black, fork crown was black, brake levers were black and the shifters were mostly black. So the only real siver bits were the rims and seatpost. Hence can't really agree that black parts don't suit is as that's what was mostly speced on the original bike.
I've taken a photo of it standing next to my Voodoo Wanga, and the geomety looks pretty similar. The main difference is that the front end is 20mm lower unsuprisingly (100mm forks on the Wanga). So it looks like Joe Murray has kept pretty failthful to his original designs, only tweaking them to suit longer forks.