Just having a quick look at that map for stage 3...I've ridden, climbed, abseiled, and driven around there a fair bit. It looks like you'll be linking the awaba race area with sawmill. The fire road link gets a lot of dick heads in 4WDs and dirt bikes (a lot of responsible nice people as well) so be a touch careful as they don't often view sharing the road as an obligation up there. The sawmill is a lot of fun and an easy ride to do outside of the race, especially of you shuttle up to it! There is a bunch of other old single track merged abandoned fired road riding in the area as well.