A transverse triple-expansion paddle warship is technically plausible

How realistic is a paddle-driven warship with a transversely mounted, possibly inverted triple-expansion engine?

The basic idea is realistic because triple-expansion paddle vessels and paddle gunboats existed, although the proposed orientation would require detailed engineering.

The fictional concept places a triple-expansion engine transversely, possibly inverted, to drive paddle wheels. Real paddle steamers used triple-expansion machinery, and some served as gunboats, so the underlying propulsion combination is historically credible. The exact orientation would still have to accommodate cylinders, condensers, shafts, maintenance access, and the hull's weight distribution. Surviving paddle steamers on Swiss lakes and the British coast provide tangible examples of the broader machinery family.