My 00-SF roller track gauges arrived from the USA today. Manufactured in brass by Russ Simpson they appear extremely neat little pieces of kit, with very clean machining and a very snug fit on code 75 rail.
Brian Tulley is currently sourcing a manufacturer for roller check rail gauges, and I've indicated my interest in being part of an order for a pair of these.
Hopefully I'll be in a position to start building some track soon!
For more info, see the 00-SF Yahoo group.