I have received a number of excellent suggestions in the "Airplane" section, so I thought I would continue my quest here now. I want to recreate a diorama of my Grandfathers plane and his crew photo on Tinian in either 1/72nd or 1/48th scale. I am leaning more for 1/72, due to the size of the plane even at that scale. I have uploaded photos in "my photos" on here for all to see. Now for the Q's.
It seems that crushed coral was used for the "parking" area's for the B-29's on Tinian. I want to recreate this area (see photos). I have received many good suggestions on how to do this, including powdered corral from a hobby store, sand paper, etc. If I choose the powdered corral, how do I "glue" it to the base of the dio? What would be a good way to show oil stains?

I also want to achieve the "weathered" look on the airplane. How do I paint weathered aluminum? Also, how do I show the weathered leading edge of the wings (see photo of wing with weathered edges)?

My grandfathers plane is B2 / MIS-CHEIF-MAK-ER, as seen in the photos. I want to recreate the crew photo, where they are next to the nose art of the woman. Where is a good place to get custom decals made? I would like to get the nose art of her made and the Hellbird logo on the other side.

Sorry for all the questions, but this is my first dio, and I want to present it to my family as a tribute to my grandfather on the 10th anniversary of his death (I have 2 years to get this right). This is also the first model in 20 years, so there will be many more Q's to make it right!