Not sure about Melbourne sorry, but just give Trent a call at Status (Think it is Checkered Tuning now?) and see what he says.
At the end of the day, if some one told me I had to build a NA RB to make power it obviously is possible, but not cheap at all.
Making power out of a NA RB is the same as making power out of any NA engine. I would try to chase power through high compression, higher displacement, high revs and high air velocity.
RB30 block with a NA RB25 head.
Custom high compression light weight pistons, light weight balanced rods and crank to bring compression up to something high like 12.1 and run E85 fuel only.
Build the head with large duration and lift cams. Open up the valves with oversized valves.
Heavily port the head and build it and the engine for high RPM depending on where the power band would be.
Individual throttle bodies.
Tuned length extractors.
Light weight pulleys.
Lightened flywheel.
Shot of nitrous oxide.
etc.
As you can see it aint an easy or cheap job and really only doing a part of it aint going to give you much gains without doing the whole lot.
The most I have seen on here from the NA section from a RB25DE is around 130-140rwkw. Which is dick all really.