As for the aircraft itself just looks so good I wonder if there would be a way of recreating the whistle of DB running in at full tilt or would that mean more
manufacturing and also alter the appearance it has ?

The Allison is about 10L smaller than the DB605 so its exhaust note could lack a bit of oompf by comparison. Making new camshafts with a similar valve timing profile as the DB605 might help. But the defining audio characteristic (in my mind at least) of the German V12s is the “supercharger whine”. I put that in inverted commas as I’m fairly certain its not the supercharger impeller/volute per se that causes it otherwise it would sound the same as an Allison or Merlin supercharger. Assuming I’m correct then it comes from the supercharger fluid coupling and/or the bevel gear driving it. Perhaps a similar sort of noise making contraption could be created to run on one of the Allison accessory drives. All the rest of the gearsets in the DB605 are essentially the same as those used other aero V12s.

The R-2800 seems to be the preferred choice for Sea Furies now, see here: http://www.sandersaeronautics.com/restoration_seafury-r2800.asp

115/145 avgas is still available from VP Racing Fuels in the US.

With respect to the oil issue there is some potentially good news on the horizon in that the Swift Fuels 102 octane unleaded fuel looks like it will become a reality (fingers crossed). This opens up the possiblity of using synthetic oils in aircraft piston engines. https://swiftfuels.com/fuel/ul102-avgas/

Did the Napier Sabre use Aeroshell 100U or was that a post war development?

The Napier Sabre deserves a book. As do the Daimler and Jumo V12s. I would love to see the auto/biographies of Richard Vogt, Ryoichi Nakagawa and Takeo Doi translated into english. The remaining 5 volumes of Janic Geelen’s study of the de Havilland company are notable for their absence. The Grumman OV-1 Mohawk and North American OV-10 Bronco deserve more than a couple of skimpy modellers’ walk arounds. +1 on French aeronautical engineering, an english translation of ‘les Avions Caudron Renault’ by Mihaly and Robinson would be a good start. A Piper equivalent of the ‘Cessna Wings for the World’ series would be nice also.

Oooh, brand nostalgia. In addition to Douglas (pre MD) I miss Convair, Lockheed and deHavilland in the airliner market too.

If you would like an overview of the various trials and tribulations of the american aviation industry try ‘Pushing the Envelope’ by Donald Pattillo.

The Classic Publications series are currently about as good as it gets for English language German aircraft monographs. I haven’t read the He 162 book, but I have a number of the others in the series and I don’t think you would be disappointed with it.

However, before reading it, I would urge you to get a copy of “Arming the Luftwaffe” by Daniel Uziel.

The main topic of the book is the German aircraft industry as a whole during WWII, but it has a fairly comprehensive case study of the development and operation of the He 162 at the end of the book. Published in 2012, this book seems to have slipped under the radar which is a shame because to my mind at least, it is something of a landmark work.

There are (were) the Griffon powered air racers – Red Baron, Miss Ashley II and Precious Metal. A MkXIV Spitfire (race 80?) put in an appearance in one of the post war Thompson trophy races.