I'm working on a this very diorama as we speak! Finished the AM B-25B "Ruptured Duck" last month (awesome kit!) and picked up a cast resin 1:48 deck base from a vendor at the S.E. Reqionals 2 weeks ago.
So far, I have fabricated the hemp rope mooring tie-downs by twisting strands of fine copper wire together to make each rope, and soldering three "ropes" together at the top to go through a "mooring point" shackle scratched from everegreen plastic. YES, apparently they weren't steel cables, but hemp rope! I always assumed they were cables, until I did further research. I drilled a hole in the underside of each wing to push these shackles into. The holes are already started on the kit. They're just outboard of the engine nacelles.
I figured that copper wire would remain rigid, and kind of stand up on its own--instead of actually trying to "lash-down" a model to a deck base with tensioned line, string, etc. The 3 lower points will be fastened into the photo-etched tie-down strips that came with the base.
So under each wing, there will be a 3-point mooring harness, a 2-point under the tail, and a few lashings around the nose gear. Trying to make it as accurate as possible, based on the pics I've seen.
While the B-25 was still in primer, I used a heat gun to shrink a scrap of ziploc bag plastic over the upper turret bubble to form the "tarp" used to cover the upper turret while underway on the Hornet. The "strap" that went under the belly to hold the tarp on will be made from thin lead tape.
I don't want to tarp over the engines, because they're so pretty LOL.
I'll post pics when I'm done in a week or so...and yes, I plan on adding a fire bottle and at least 2 figures.