This an attempt to create a replica of the famous British FV4005 Stage II tank destroyer, it was necessary to visit several websites and see several images to get a good reference but here it is.

FV4005 SatgeII II Full Detailed

During the development phase of the FV215B, another project was done on the Centurion. Labeled the FV4005, it was an attempt to mount the 183 mm on the Centurion hull. The design phase is distinctive in two parts, Stage I and II. Stage I had the gun mounted on an open-topped hull. The gun had a concentric recoil system and an auto-loader. Stage II had the gun encased in a lightly armoured, splinter-proof turret with a conventional recoil system and manual loading. Though a single prototype was made for testing, the project never passed basic feasibility. In August 1957, the project was abandoned as well. The lone prototype is currently stationed outside at Bovington Tank Museum.
Despite being an extremely prominent target, the turret armor was only 14 mm (0.55 in) at its thickest. This was easily penetrable even by large caliber machine guns rounds. It also only had enough space to store 12 rounds . These rounds were stored in racks of 6 on each side of the large bustle.

The turret housed 4-5 crew members. These were the commander on the forward left, gunner on the front right and 2 loaders positioned behind the gun. On the left of the gun, in a small box on the cheek, was a coaxial .30 cal machine gun. This was most likely used for ranging rather offensive/defensive fire. There was a large door in the rear of the turret bustle for crew access and ammunition re-supply. The driver was located in the standard position in the hull

It should be noted that the lack of armor was intentional. This vehicle was designed to engage at long-range, shoot and re-position. Flexibility was slightly hampered by the turret, however. In theory, it was fully traversable. On uneven ground, this was not recommended due to balancing issues with the gun. As such, the vehicle only really had a 90 degrees arc of fire to the left and right.

In 1950, work started on the Ordnance Quick Firing 183 mm (7.2 in) L4 gun. At the time, it was the largest and most powerful tank gun in the world. The cannon was based on the 183 mm (7.2 in) BL 7.2 inch howitzer, a WWI era weapon. The gun itself weighed a mighty 4 tons and when fired it produced the equivalent of 87 tons of recoil force. The L4 was designed to be chambered for only one type of ammunition, HESH (High Explosive Squashed Head). It was separately loading ammunition. The projectile was loaded first followed by the correct propulsion cartridge. Each shell weighed a combined total of 104.8 kg . A shell of this size understandably produced a substantial amount of fumes and smoke inside of the fighting compartment. As such, a large fume extractor was added to the barrel, a relatively new feature at the time. The L4 was expected to have a rate of fire of 6 rounds per minute, as such, the gun would require 2 loaders to service the weapon effectively, but it didn’t work like expected , in practice the recharge time took from 45 to 30 seconds.

The 183 mm was tested in live fire trials against a Centurion and a Conqueror. In 2 shots, the 183 blew the turret clean off the Centurion and split the mantlet of the Conqueror in half. In total, the gun fired 150 shells.

The FV4005 Stage II is the only one of these 183mm armed vehicles to survive to this day. The turret is original, but it was mounted on a spare Mk.VIII Centurion hull, not the original it was trialed with. It is missing the recoil spade and travel lock. This “Cut-and-Shunt” representation of the vehicle now sits as a “gate-guardian” at The Tank Museum, Bovington, alongside an M4 Sherman. Its predecessor, the FV4004 Conway is safe and sound in the VCC (Vehicle Conservation Center) at the site.

The 4005 as it stands today outside the Bovington Tank Museum

FV4005 Stage II Specifications
Dimensions (L-W-H) 7.82 (without gun) x 3.39 x 3.6 m
(25’7? x 11’1? x 11’8”)
Total weight 50 tons
Crew 5 (driver, gunner, commander, x2 loaders)
Propulsion Rolls-Royce Meteor; 5-speed Merrit-Brown Z51R Mk. F gearbox 650 hp (480 kW), later BL 60, 695 bhp
Speed (road) Apx. 30 km/h (19 mph) (I incresead to 40 mph to best experience)
Armament QF 183 mm (7.2 in) L4 Tank Gun
.30 Cal. (7.62 mm) machine gun.
Armor 120 mm frontal hull armor. Turret 14mm all over.

I decided to change some features so you have a better experience when you play. I increased the number of rounds from 12 to 200, to avoid restarting the phase all the time, I also raised the top speed to 40 mph, to don’t be too slow and decreases the reload tiem to 10 seconds. I didn't put too much detail into, so the game wouldn’t crash or lag but i'm making a fully detailed version. I tried to be as faithful as possible to the model, I apologize if I leave something important out or if I did something wrong.

Obs: I used as main reference the model that is in Bovington and after reading a little more I found that this isn’t in the original chassis of Centurion III but in the Centurion VII, the mainly difference is the front, unfortunately it was too late to change so I decided to leave it, sorry.

Controls - AG1: Starts the engine
AG2: Turn on the Lights
Throttle: Accelerate (I recommend using only 15-20% of force on flat terrain, use more if you need to climb steep hills).
Brake: Stop
Yaw: Turn the tank
Roll: Horizontal Axis (Turret)
Pitch: Vertical Axis (Cannon) (Enable the mouse as Joystick for easy movement)
Fire Guns: Fire the Main Armament and the coaxial machine gun.
Cockpit View: Commander / Gunner View
Cam 1: Driver View
I used the map Kumamatanga Archipelago of mikoyanster to take the screenshots.

I think that’s all, I tried my best for make it realistic, I hope you like it. Thanks for the support of all, comment what you think of this project and upvote also, enjoy and see my other projects, I know you’ll like, Ideas to improve my projects are always welcome, please if you really like this project upvote, don’t forgot. Also, sorry for my English.