Do a search on google mate, everything is out there on many a forum. 6kg's seems to be the optimum weight though, any lighter and they can get abit rattly etc mines 6kg's and still idles like its standard.
Keep a look out for secondhand flywheel cheap, then vr6 sachs or luk clutches are about 120 quid, all bolts, both flywheel and clutch cover bolts are around a tenner. Then you just need to get the flywheel lightened and then clutch cover and flywheel balanced by an engineering company.