Nice idea. Here's my two bits.
If the quad had greased that a/c it was probably more or less a head on approach shot, and it'd take only one hit to bring her down with those 20's. Or it could have hosed her from the side, sure, but she'd be in little pieces. A spit is not a flying tank. A cannon hit on that flimsy little a/c usually was a big punch in the face, at least a hole you could pass a grapefruit through. Could have cleaved the engine in halves...hmmm?
Second, here comes this Spit at 3oo knots doing what ever it's doing and it meets up with one of Rhein Metalls finest. It's either nose in and disintegrate, or mortally wounded, fly on another little ways before crashing in a way that the pilot survived, Which means that in your scenario the AA guys would probably have turned around, if they really wanted those Merlin valve covers as souvenirs, and trekked back to the column of smoke. Which suggests they be pointed in the same direction as the a/c.
I did a little research a while ago on modeling crashed a/c's and one thing I learned is that most (non armor) a/c skin from the era is around 0.040 or so, which at 1/48 is heavy barbeque foil, easy to find in Texas, right? no we don't barbeque in California, we grill! How cute.
Anyways, it works pretty well to take a piece of the stuff and rub it down over the plastic wing or whatever and then distress it any old which way and toss it on the ground.
Happy hunting!