Good stuff Prem, and great pics Vaughan.
Just had a thought re the final colour scheme, to keep it easy. This kit is actually Revell's original Bf109F, with added parts to make the 'G' variant. You could leave off the 'Beule', the bulges over the gun breeches on top of the cowling, and make an 'F', don't paint in the central frame on the canopy, and finish the model in a very early 'F' scheme, similar to the 'E' you posted. Or, do similar, and paint in a desert scheme as a 'F' or early 'G'.
This would allow a nicely finished model, without the complication of mottle and airbrush use.
BTW, Revell are releasing a new tool Bf109G-6 in December, which should be excellent, and will retail at under $30 in the 'States (£19.99 in the UK).