Working on it. The truck carriage portion is the big problem. That photo posted a couple of times earlier is the
only image of that style of carriage I have been able to find, and there's a lot of details I can't see. I thought maybe it was either a 4-truck carriage or a Marsilly carriage modified, but it's neither of those. I can't find any reference to it in ordnance manuals, patents, and the image doesn't say what ship it's on.
My model has some conjecture, beyond what I can see, or think I see, in the aforementioned image, resulting in this, so far. I'm sure the trucks on the carriage are too large, and the slabs under the slide chassis haven't been shaped yet. I did model the seam in the carriage sides as it was rather pronounced in the photo.
The tube has a full bore, but I didn't model the touch-hole. I will add an impression of the firing mechanism, since I think it's absence could be seen even at 1:96 scale. The two fellas in the pic aren't my models but STLs I bought to make my
Constellation's crew.
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Actually the carriage looks
a little like the Marsilly. The slight slope if the side's forward face, the side seam. It looks like they eliminated one step coming down the ski-slope behind the cap-square, and the sides look straight fore-and-aft on the pivot rather than angled like the Marsilly.
View attachment 428225