Here's the Churchill Mk.I tank, complete with the hull-mounted 3-inch howitzer.
About this creation
I went more for looks than for functionality, so the gun doesn't elevate or depress.
I'm pretty sure the howitzer is mounted a bit too high.
The suspension, which I'm pretty sure is a new design.
The upper hull attaches to the suspension by two studs, so it makes room for modifications made to the upper hull. It's a decent connection, slightly reinforced by the treads.
Treaded, probably by some pesky Pz.Ics.