The large iron bolt throwing machines are actually from the Goblin range by Mantic. They have a perfect space for a Mongol shield rather than a Goblin shield or symbol on the front. They are both mounted on 50mm square bases. These are a great model and are metal and it's been a long while since I constructed something metal and of this size. A little cleaning up and a little filing and they go together reasonably well.
Cheers from Brendon