Good stuff Geo.
However, note that Eduard. along with a few other manufacturers (ICM, Otaki being worse), have got the Spitfire spade grip wrong in its shape, in this case being too 'flat', or 'angular', particularly along the lower section.
The 'Dunlop' spade grip of the Spit and Hurricane were virtually circular ( the outline often appearing to be different due to the various styles of gun bottom on the top left of the grip) and, without the 'rubber' grip coating and the gun button(s) looked more like that in the Harvard pic you posted.
Use the Spit grip as a guide for size, but make it a ring, with stretched sprue probably being better than wire, which is a b*gger to get right and keep it's shape one done !