The I-CA shouldn't carry strike markings. Your I-CA out on the site does. I edited out the strike marking on the I-CA I downloaded (bucket fill works wonders with those squares), and I made myself a CA-673, CC-01 and CV-04 skin.
I'd do the same with the DN, but I don't know how you would put on the extra sets of dots necessary. The longest dot pattern needed would be 6 blocks (start, DN, Carrier / special for the DNT, space, 2 blocks for numbers, while you've already set it up with the shortest pattern (Start, DN, Space, 2 numbers).
For now, while you're still creating the ISC fleet, I'm just taking your base hulls and re-marking them for the various specialty jobs. If you make dedicated carrier-hulls etc, I won't need a permanent CVA skin for the DN model. So, I was just wondering how you would have approached the issue, and if I get desperate for a CVA skin to hold me off till the carriers come out I could do it myself. Build the ships, I could re-dot them myself if I need to...
On a side note, my understanding of the strike modifier is this, taking the 2 rules shown in the R-section:
1. Used on PPD-only Ships
2. The DN, a PPD-only ship, is demonstrated with start, DN, space, number number blocks.
So, I believe the strike modifier is used only on ships that have distinct Plasma-only and PPD-only versions. Off the top of my head, there's the CL / CS pair, the CVL / CVLS, CV / CVS, and maybe the battle pods.
Do you mind if I use your DN in my sig? I'll credit the ship as yours, but I do have a tendency to use smallish text (the credit will be no smaller than the bit about me flying Klink on some server...)