Ran one at the last show without a problem. Note those are six axle trucks on the end trucks so not recommended for tight radius turns! The flanges are about pizza cutter size and the rapido couplers are of a design I haven't seen and don't look like they will be easy to convert to MT. It also doesn't roll real well. The barrel does raise up and down, so it had no problem on an NTrak layout. It came with what looks like a spare set of railings, although the railings, while large, seem pretty strong to me. It also comes with a cute cart that has shelled stacked on it that would ride on the rails from the crane to the breech.
The real gun was captured in Italy and made whole using parts from another gun. It was tested at Aberdeen Proving Ground, so I pretended it had been off loaded in Baltimore and was dragged up the PRR to Aberdeen behind a box car and a couple of other cars for breaking power.
I see they are now sold out from MBK.
Bob