Hello Csatahajos
Whatever you do concerning credits - that's Colo's call - please wait with your T-Shirt project for a couple days. Then you can use (hopefully) accurate drawings of the whole King George V class, not ones depicting late 1920s fit Iron Dukes with their secondariy batteries painted over.
And then, if you want and can muster the Patience, wait some more for a set of all new Iron Duke pictures.
Greetings
GD