We still use the markers for ordnance.
On the specialist games site and in warp rift we have some cool alternative markers for various races.
If you want models of torpedoes it would already be sufficient to use the tops of toothpicks.
And for fighters, bombers, a-boats it might be even worthwhile to get some instamold thing. And make a tiny shape out of something.
Once I read a blog of someone who would only press aluminium foil (iirc) into a structure and use that as a casting to get small spaceships.
Perhaps I can find that link again.