Outstanding episode. Great work everybody, as usual. Such a quality podcast! We’re really fortunate to have you fine gentlemen cranking out these gems. 
As to @Zanko 's good entry, the artillery piece is a 1987 Man-Mangler Orc Mangonel by Kev Adams, part of the Machineries of Destruction. I can recommend checking out the pictures of both these warmachines, and the original Regiments of Renown, as well as reading their accompanying background text. It’s often funny and parodic, and occasionally it is exquisitely written.
To anyone wondering, here you can find Chaos Dwarfs Through the Ages, and the original Daemon Cannon sculpted by Nick Lund.