Here is a quick pic so far...
I also recently won a griffon mortar on eBay and I hope to use this as the base for my very own heavy siege mortars for my artillery company.
I started by converting my own artillery wheels to use on the gun carriages. I needed a small project to warm me back up to finish off the now log over due hoplite carrier.
Here is a few shots of the wheel, which I hope to cast up.
More soon. :)