We can follow my approach approach of taking over the manufacturing plants for tanks and other army equipment. Obviously there was nothing wrong with the MG 42 and the automatic anti-aircraft guns such as the 3.7 cm Flak 43 could also be useful. Sources are vague over whether there was a link between the 55 mm Gerät 58
http://www.navweaps.com/Weapons/WNGER_55_Gerat58.htm and the later 57 mm Soviet and Czech weapons
http://www.quarry.nildram.co.uk/57mm Czech.htm.
If we look at the Königstiger tank, then we get the impression that it had severe problems. For example from Wikipedia
http://en.wikipedia.org/wiki/Tiger_II, “The Soviet team gave the opinion that the tests revealed the tanks to be severely defective; the transmission and suspension broke down very frequently and the engine was prone to overheating and consequential failure. Additionally, the Soviets opinion was of deficiencies in the armor....”. However, the problems essentially arise because the tank was heavier than originally designed and the armour was produced when metals such as chromium and molybdenum were in short supply. If we had all the jigs and all the materials needed, we could build the tank out of much better armour. If we compare the Königstiger with the British Centurion II
http://en.wikipedia.org/wiki/Centurion_tank, we find that the Königstiger had hull front armour of 150 mm, sides and rear of 80 mm and a 180 mm turret compared to a 118 mm-thick glacis, side and rear armour of 51mm and a 152 mm turret for the Centurion. Thus we could simply build a Königstiger with 15% thinner armour but with the same or better resistance and reduce the weight back to that originally planned. We would quite likely produce a reliable tank, which might accept a British 105 mm gun when that became available, and would give good service through the 50s. It would remain about 4 inches taller than the Centurion but with the intended 1000 hp engine, it should be fairly mobile at 55 tons.