Rick Oliver sells the conversion kit for this, maybe worth giving him a bell

Having done a front end swap (twice) I wouldnt bother doing it again. In terms of performance I would never get to really see the benefit, maybe Im just too slow..

having said that USD forks do look sweet dont they
Yeah, I changed my mind, I would do it again, bugger the expense.

As already stated, Rick Oliver sells the required gubbins for mounting ZXR400 forks(I think) and NC35 forks to an NC30. the Spacers for the NC35 forks are very nice, and dead easy to use; put it in to top headstock, bearings in, forks on , job done. Hey presto swanky USD forks in 10 mins. He included bearings too, so no need to source them either. Sorted.