In fairness it depends how lucky you are with the front end, I got mine for less than £300 for forks, wheel, discs, axle, mudguard brackets and the calipers.

Calipers were the. Stripped, cleaned and new seals put in along with a new set of EBC HH pads.... Really wasn't expecting the pads to cast as much as they did lol

Hopefully finish it for the end of the summer lol

you got a good deal there pal, i was after some for ages for my b1h and couldn't find any for less than 300 just for the forks!

I did this conversion on my KR1.
I used ZXR400L yokes, wheel and discs, with GSR600/750 calipers and master cylinder.
The forks were sent to Mick Gardner which he he revalved, but the springs are the same.
Prior to that, I had the ZXR400L front end, which felt way too hard and choppy.
The feel of the brakes is great and not too over sensitive, and I was thinking of doing the same on my NC30.
some say that the NC would be over braked, although I don't think theres much difference in weight between the NC and the 636.