These guns weighed 8 tonnes in real life and fired 8" diameter (210mm) shells weighing 120 KG. Big guns...
They had to be based on robust, rolling chassis (so the horses could pull them) with elevating and recoiling barrels. We worked from old photographs, creating a complete CAD model in order to specify a giant, bespoke 'IKEA' kit to make these monsters
Built from laser cut steel, water cut aluminium, CNC routed ply and MDF and machined foam and fibre glass in addition to several thousand bolts these are a technical tour de force
Here's how they built and operated the real guns