I just picked one up from nitroplanes and it looks to be most like the G2-G4 versions due to the two small side scoops added to the cowl sides forward sections.

This opens up the option of using the smaller mains with the spoke hubs or the larger mains with the flat looking hubs used on early Gs

Also, I have noticed in my many books that the latter part of the war resulted in a many modifications and attachments that would give much flexibility in what one can get away with on this airframe.

Is it me, or does the spinner shape look a bit "off". Maybe if I put the cannon detail on the spinner??

Steve