After seeing the new Cauldron of Blood model, I thought it was too much. I decided to upgrade my now out of print Cauldron of Blood with wheels! (and the correct base size of course).
After searching bits sites I still ended up on eBay and bid on the wheel bits and a base for the cauldron. Lucky for me, I bought from an awesome bits store. I highly recommend http://www.ebay.com/usr/bits-world for your bits needs! </ebay plug>.
After a couple of days, I received my bits order for the new cauldron wheels and the 60x100mm base. I attached the wheels via sprues for axles
I just won the Death Hag and Attendants yesterday, so I should get them in the mail soon!