Checked it. Yep, the F had the '6 - 3' wing. It was 3 inches longer at the tip, and six inches wider at the root, and didn't have the leading edge slats, as the 'E' model had. I think you'd get away with it though, as that is only 1.5 and 3mm respectively, and the slat joints were more or less in the same position as the panel lines on the leading edge. In fact, looking at my Academy bird, I notice it's got the wing fences - I'll have to check the box to see if it's an E or F!!
Those were the only really noticeable external differences. The others were the wing hard points, gunsight and avionics etc, which can't be seen on the model!
I'll take some close-ups over the weekend, get some more info together and e-mail it to you old chap. I'm off to bed now, as I'm bushed, and got that blasted headache back.
Toodle pip.