Here are a few updated pictures of the wing as I work my way through the detailing. I want to glue the wing halves together before I start adding the rectangular slots, so that means any interior work on the wing halves needs to be accomplished first.

The two areas needing work have been identified as the aileron recess which replaces the original kit's solid wall. I will add a bull nose to the aileron at a later date and the bull nose will fit into this recess.

The landing gear wells are going to get some detailing as well. I only have a couple of images of this, but it is enough to see that the roof of the well has something similar to the detailing I am adding here. These rods will be trimmed for width after the glue dries and I will add some sidewalls and a bulkhead. Fortunately so as not to delay work on the slots, some of this can be performed later because the nacelles are separate and there is room to add the other details. But there will be a bit more detail added here before gluing the wing halves together.

And here is an updated picture of the wing slots area. I made a better rectangle by lightly slicing a strip at several measurements and then folding away from the slices to form the rectangle. This was then reinforced with extra thin cement. The white strips along the wing are shims (and mounting points) for the rectangles and will determine the fore and aft distance of the slots. Any gaps will be dealt with later after the leading edge is grafted back in place.

Fun stuff doing this scratchbuilding. I usually reserve this for 1/48 scale models and doing on this 1/72 kit is straining my eyes, but it is still fun.

You have already done a lot of work on the wing, Carl (@clipper). Looks great. You might try going to Scalemates.com and download the instructions for the MPM Hudson. For the areas with few photos, you could see what the shape of the parts were that they used in an area like the wheel wells. Might help with the detailing in areas where the photos are scarce.

Thanks John (@johnb), George (@gblair) and Spiros (@fiveten). This has been an interesting little side project.

George, the image I have of the landing gear well is good enough for my purposes, but I know what you mean about using whatever resources you might have. I've done this before. Even other modeler's builds can serve as a resource because sometimes what they've done can clarify some aspect of a detail that isn't clear in a photo or drawing.

And here are some more updated photos.

First adding the rectangles.

Then re-fitting the cut off leading edges.

Rectangles trimmed down and sanded to the surface. Then sprue goo to fill in the gaps

Sanded down the sprue goo and use CA to fill any remaining minor issues. Compared to the original wing. Note that the hole in the original was my first attempt at this and this will go away when I do this other wing.

The two inboard slots have splitters which are being added here.

And in between sessions with the slots I am gradually working on the main landing gear wells (as well as the other wing)

Great job on the slots, Carl (@clipper). This should improve the appearance of the Airfix wing considerably.

Thanks John (@johnb), George (@gblair), and Spiros (@fiveten). I'm a firm believer in these sorts of details which can add a lot to a build if they can be done without too much trouble. In this case, even though it is more trouble, I wanted to go the extra effort to push my skills envelope and see what I could do with this model and in this scale. I only have one other built model (a B-17), in this scale, but I have made the decision to do most of my larger aircraft builds in smaller scales, (mainly to save room). I wanted to make sure I could still add an acceptable amount of detail.

Nothing better than to expand your (already superb) skills envelope, my friend @clipper! And I agree, all added details make a model stand out.

I'm probably crazy, but I am going to try something new for me, namely, scratchbuilding the main gear struts for this kit. The kit struts are very crude and basic and will be out of place. I've been looking over some photos I have of the struts as well the materials I have on hand and I think I can manage it. A few parts will need to be soldered together for strength, but the remaining can be attached using CA glue. I'll have more details as I get into this.

Very impressive, Carl @clipper
You are definitely challenging yourself with this build, especially with scratch building the landing gear.
Looking forward to your approach on this.