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Things I seem to recall that changed with ! on what I place high accuracy for memory:
Disk Brakes!
Fuel system for inverted flight!
Oil system for inverted flight!
Variable prop?
Modified canopy mounting so it could be removed and used as an emergency exit!
Up to date radios.

I believe unlike the Z the original R's had counter balanced control surfaces, so I don't think that was changed.

He was adamant it had to be as original as possible in terms of aero.
Was part of the appeal of building a flying replica in the first place.


I'll have to hunt up my book that Steve Wolf and Delmar Benjamin put together on the build.
They werent allowed access to the plans, but there were suffecient photos to match up dimensions.
They also got access to a non flying airframe replica that had been built by the plans.


When it comes to in cabin exhaust,
Individual exhausts for each cylinder all the way around.
Cockpit is in low pressure zone.
Not sure what could be done.
If you seal the cockpit you run out of oxygen yourself.
How to resolve this without messing up the sound or look of the airplane?