leaky if i am reading this right, you want to do the italeri s-boat, under another flag, as far as i know, the s100 type was only used by germany, but after the war the U.S.A and Britain got a few and some ended up in Spain and Sweden etc, the Italians had their own boats [ new release from italeri later in the year]
so it looks like you can only do a German version, unless you have a go at a postwar type