There previous option offered if you remember was using a new turret utilizing the original armour, the new turret being built from the start as a plugin to utilize the 120mm Rheinmetall gun. This from the sights looks very much like the same turret, albeit with a new armour pack on it. Its certainly at its basis a Challenger 2 turret,you can tell by the loaders episcope and the commanders cupola. I think they could put in an ammunition bustle if they gutted the rear of the turret, which we speculated on before. If they are designing a new turret from the ground up, that is obviously easier.
How much room does the autoloader take up? Ive no idea, it would be helpful to know whether its based on a naval design. We seem to be ablet to design fairly compact autoloaders to fit in naval turret, It may be this one has a similar lineage.
The wiki article on this weapon is interesting.
Rheinmetall introduced a larger Rh-130 130 mm L/51 tank gun at Eurosatory 2016 in June 2016. Development commenced in 2015, financed entirely using internal funding, as a response to the Russian introduction of new generation armored vehicles like the T-14 Armata tank, and the first technical demonstrator (TD) was completed in May 2016. The new 130 mm gun has an L/51 chrome-lined smoothbore barrel with a vertical sliding breech mechanism, increased chamber volume, no muzzle brake, a thermal sleeve, and a muzzle reference system (MRS) enabling it to be boresighted on a more regular basis without the crew needing to leave the platform. Compared to the 2700 kg 120 mm gun, the 130 mm has a 1,400 kg (3,100 lb) barrel and an all-up weight of 3000 kg including the recoil system.
Rheinmetall is developing a new generation APFSDS round featuring a semi-combustible cartridge case, new propellant, and new advanced long rod tungsten penetrator as well as a high-explosive air-bursting munition (HE ABM) based on the 120 mm DM11 HE ABM in parallel with the gun; the cartridges are 30 kg (66 lb) and 1.3 m (4.3 ft) long with, according to the company, the increase of 8% in caliber resulting in 50% more kinetic energy over the 120 mm gun.
Engineers believe the weapon can only be used with an automatic loader and new turret design. The gun commenced static firing trials at Rheinmetall's proving ground following Eurosatory, while engineers hope to receive a new NATO standard by the end of 2016, although development of the gun and ammunition will likely take 8–10 years. The 130 mm is designed to equip the Main Ground Combat System (MGCS), a joint effort between Germany and France to produce a successor to the Leopard 2 and Leclerc, possibly to be launched between 2025–2030. Rheinmetall has also mounted the gun to Challenger 2 meaning it could be a possible option for the Challenger 2 Life Extension Program (LEP) 
Edited by Stuart Galbraith, 04 August 2020 - 0156 AM.