Great pics, stickpusher. The middle one is, to me, the iconic shot of Cactus in that period.
Henderson Field, the original strip, was just used for bombers by September 1942 when Fighter 1 ("the cow pasture"), a rolled grass strip, came online. Fighter 2 was finished in February '43, about when F4Fs were rotating out for F4Us, and had two strips, one with Marston Matting and one with crushed coral.
In depicting a Wildcat at Guadalcanal, the most likely scenario would be at Henderson Field in August, or Fighter 1 from September through early 43, and so dirt and fading, along with general wear and tear, is appropriate, but not the heavy chipping on the leading edges like you often see with land based Corsairs.
Best
-J