Maybe it could be an option for the centurion kit of RM ? IMO rubicon would have just to update the gun to fit the specific one of an AVRE.
The Centurion AVRE entered service with the Royal Engineers in 1963 alongside the FV3903 Churchill AVRE, as it gradually took its place.
It was assigned to the three Armoured Engineer Squadrons of the 32nd Assault Engineer Regiment. These consisted of the 26th, 31st, and 77th Armoured Engineer Squadrons. The AVRE’s roots in the 79th Armoured Division and ‘Hobart’s Funnies’ were never forgotten. To this end, most of, if not all of the Centurions had the famous Bulls Head insignia of the 79th applied somewhere on their armor.
Only the British Army would ever use the Centurion AVRE. It took part in annual training exercises in the UK, Germany, and even BATUS (British Army Training Unit Suffield) in Canada. It famously saw action in ‘The Troubles’ in Northern Ireland in the early 1970s, and later in the First Gulf War in the 1990s.
The Ordnance BL 165mm (6.5 in) L9A1 Demolition Gun fired a 64 lb (29 kg) High Explosive Squash Head (HESH) shell up to 2,400 m (2,600 yds). The gun was reportedly accurate enough to blast a bridge girder at 600 yards (549 meters) or hit a pillbox or bunker at 1400 yards (1280 meters). At greater ranges, it was an effective Area-Of-Effect (AOE) weapon. The gun could elevate 20 degrees, and depress 10 degrees, though depression was limited over the engine deck.
