More ideas:
German ChieftainI've got a half-finished model of a British Army Marder, so how about a German Chieftain/Challenger I as a quid pro quo? They might conclude that the Leo I's 'protection through speed' philosophy was wrong-headed and that heavy armour is the way to go or that the Leo needs a 'heavy' tank to back it up (really a return to WWII ideas), so they buy the Chieftain, suitably 'Germanised'. I'm thinking:
Smoothbore gun (or maybe they're convinced by the L11 - they used the L7....)
MTU engine
Solid turret bins instead of cages
Small IR searchlight mounted over barrel instead of turret side unit
Open tool 'trays' instead of some track guard boxes
Twin low-profile cupolas with skate-ring MG3s instead of big cupola plus plain hatch
A German buy might convince some other NATO nations to follow suite: Belgium? Netherlands?
Chieftain ATGW carrierSuppose the British Army decided it wanted a heavy, sohpisticated ATGW carrier similar to the Jagdpanzer Rakete instead of the FV.438? The result might have a fixed superstructure (FV.438 on steroids) in place of the turret with muzzle-loading Swingfire boxes overhanging the engine deck.
OR
It could have a rotating turret that would look a bit like a Chally II, but with 16 elevating Swingfires (2 rows of
in the bustle, reloadable externally, plus a RARDEN at the front. The turret crew would be just two: gunner (missile and cannon) sat where the Chieftain's gunner sits, and commander/cannon-loader on the other side.