I've built 2 of these in the past, both for brother-in-law's birthdays, and wanted one for my own. I've got a few things to shoot but not as big as this. The barrel is Brook's longer 50 cal howitzer. Longer than his standard one, it has nicer proportions and is actually kind of contemporary looking. Plus mine had to be bigger than the brother in laws. The plan is a naval carriage first then eventually a field carriage (if I can pull off wheels). Here's a shaded image from the carriage cad file and the barrell and plans.

I started from an image in Round shot and Rammers and alterd the proportions to fit the barrel. I'm actually making 2 carriages, one teak and one hickory. It's kind of an experiment, set up and do the cuts more than onece. I'm tempted to polish up the barrel to get a glamour shot in the teak carriage and then patina it for the hickory barrell. We'll see how my motivation holds out. Here's the glue up.

Here's the loose assembly before the cutting was finished.

Finally made something for real on my new-to-me lathe. Turning the axles and wheels.
Sorry if I'm jumping arround a little, in a hurry. I'm further along than this but haven't take more pics yet.
thanks.