The flooring of the Revell 1/48 kit tells us to paint the floor “brown.” A little research tells us that the actual flooring was painted with a mixture of Flat Black mixed with sand to make a non skid surface on the plywood base. I have found that very fine “emory sanding strips on cell” makes a perfect suggestion of the actual surface. I hope this suggestion solves the question of many modelers who are wondering what “brown” Revell is suggesting.
Renovabis
Interesting tip, does the floor texture go for the P-51A also?
No, the floor of the Allison-engined P-51’s was the top of the wing assembly.
Thanks for the tip. I was just going the use testor’s “wood” arylic and dry brush a little flat black in streaks to simulate grain. I didn’t think that was very accurate though.
A recent photo taken by my son in the cockpit shows the floor in this particular P51 b/c a “fruitwood” brown, but I’ll stand by my research from old Eighth Air Force information. Standard usage was not necessarily followed.
I have built several WW1 models that had a lot of varnished plywood in the interior. I am into making inkjet printed decals. So I used my camera to shoot some varnished oak doors, and used the photos to create a wood grain decal. I am now starting to see commercial decals of wood grain appearing at hobby shops. To me that is easier than painting wood grain.
I’ll haveto check those out for sure.
This is what the floor looked like. Covered in Sandtex.
Renobabis:
What exactly is ‘emory sanding strips on cell’? Is that a brand or just a description of the product?
Looks like wood: 
That picture is a restored aircraft and is not what actual, WWII in-service cockpits looked like. Note the instruments, the layout, the LCD screens, the seat cushions - all of these are not WWII vintage.
Indeed there is a wide variety of authenticity in museum aircraft. Some museums I know go to great lengths to get materials and finishes correct. However, the goal of some museums seems to be to make their exhibits look as “pretty” as possible 
Nice pipe and roll on the upholstery 
Sure does! But, this aircraft has been upgraded. While not actually “restored”, it is refurbished and, very nicely, too!
All the best
Ray
I’m sure you know “emory paper” I hope I’m spelling it correctly. It is a very fine sanding paper, The pieces that I acquired came (I think) from landscape architect materials sold by Michaels. I believe it was made to look like asphalt driveway, or some such surface. The scale of it is perfect for “wing walks” and, alas, P51 flooring of 1/48 scale kits.
500# grit, black wet or dry sandpaper cut in strips. I believe that should emulate what you are looking for.