Ok here are some for starters.
1) Sump/Diff Adapter: There are people offering these but they take alot of work to fit/line up. Chunks of the block on the diff side of the sump ie webbing needs to be removed to clear the studs from the sump.
2) Head fits straight on as per normail RB26/30 engines, only thing I recommend over and above the normal modifications is the additions of a oil drain back from the rear of the head to the sump.
3) Oil Pickup, im sure there are a few methods but due to the oil pickup on the RB30 being too far back this needs to be blocked and then be tapped into from the outside of the block, the pickup on my engine is boxed and mounted to the base of the sump with a line running to the turbo side of the engine/sump. this is then connected to the oil pickup tapped from the outside with an inline filter.
4) Compression ratio on mine is close to 9.0:1, by using positive RB26 CP pistons.
Hope this helps as a starter.
NissanFreak