Nah, they're a factory built wheelset. They're nice, but I wouldn't pay £600 or whatever they are RRP, they came on a bike.
Dunno if I'll be racing it, to be honest I've had a very expensive month, and it may be back on eBay before long!
If I keep it then I probably will race it occasionally, it's only half a pound lighter than my FS, so it would have to be a course which is really hardtail specific, but if I've still got it for the first round of the NPS at Sherwood it may get a race number hung on it!
There's loads here, take your pick! They're a bit more expensive than when I bought, guess the dollar's got stronger. There are a few different designs, and they do get sold at different prices, so have a look through all the sellers.