So much sanity here, so much disappoint...
UF-SPT-39 "Earsplitter"
An antitank position on treads.
With the recent upgrade to enemy ordnance, it became apparent that weaponry will continue to escaplate. We cannot abandon our tanks, so we must race to meet the enemy developments. I propose that we do so, but first, we ensure that we will never be caught completely unprepared. To do so, we must have a mobile unit of extreme armour and ordnance faculty. I propose:
A turret, of 120mm sloped forward armour, 10mm of steel at the front for hardness, 10 at the back for rigidity, and a 100mm slab of aluminium sandwiched in the middle to reduce weight. The other angles do not matter so much, but they need something... Two periscopes over two cylindrical holes for drum-jointed guns to seat. A pair of ammunition racks capable of holding at least three rounds each. And fully motorised rotation and elevation with an arc of at least 45 degrees with a reserve of battery power along with power connections to an absent base to recharge its batteries and convery control-commands from a pair of levers. Also a pair of slits at the back.
A Track with an armoured tank engine, multiple fiuel-tanks, and ammunition conveyance. along with a generator to provide power to a turret. And two large caterpillar tracks(With odd holes at regular intervals) with a heavy steel bracing pillar running heir length and affixed to a large, heavily armoured platform at the front(held in place with six 100mm pipes and 200mm disk as the platform itself.).
A pair of 120mm cannons. With drum-joints by which to be hinged in a turret. shields towards the back to extend out the back of a turret and travers up/down without exposing the innards, a loading gear to push the rounds to the back of the gun when loaded from a mid-point, and the ability to fire high-velocity penetrator rounds, though they will, for now, only be issued with snub-nosed high-explosive rounds with a low propellant volume for maximum damage against 'softer' targets and low wear until the kinks can be sorted out.
Howeve, any and all of these considerations can be sacrificed for these final necessities:
All components must be capable of being aiir-lifted by the reckless effect and dropped from altitude. We predict this sets a maximum limit of 3 tonnes to account for support elements and safety margins.
Field assmebleable into a single unit, ideally by as few as two dozen men. We expect this to require numerous ropes and rings upon the items themselves, along with some clever tricks...
The assemblage process would start with a Track-unit being righted and driven to a turret-unit. The turret unit would be tipped onto its face and the tracks would drive up behind it. A pair of choks would be inserted into the tracks and the turret would be pulled back onto the choks, with a notch catching on them. The tracks would then be wheeled backwards,pulling the turret over its platform, at which point one final heave pulls it off of the choks and it pulls backwards backwards while the turret finally rests in place. The guns are then pulled onto their ends and then lowered into place, again, this makes extensive use of attaching ropess to both ends, and obviously the entire top of the turret needs to open for this event. Obviously the turret's seam would have a pattern to prevent a perfect seam running straight through it.
It would be lack the combat mobility of a tank, or even tank-destroyer, but would be small enough to overcome some terrain disadvantages and hide in things like suburban garages. It's purpose would be to be under the authority of infantry units to provide heavy anti-armour support for defensive positions and ambushes. It would be extremely vulnerable to flanking attacks, but would hopefully be used in well fortified positions or used with the intention to overwhelm the enemy with surprise and thus if the retreat is xcalled everyone else is likely in just as much trouble... Its greatest strength would be to provide extreme stopping power to paratroops, provided it can be deployed to a relatively large area of relative security to be gathered and assembled.
1200 mm is very ambitious for air-drop so that will probably have to be abandoned, but I would really like me some extra-heavy front plating for long-term "don't come at my face"ness...