Pierre, nice photos of the Merkava (from Saumur?), unfortunately not a Mark III. Seems to be a hybrid Mk.I/II. Quite the anti-slip coating on the turret!
The Academy Mk.III is based on the prototype at Latrun Museum, so to make an actual production version it needs work. Legends has a new turret out for it, also Cromwell, AEF Designs do stuff. Castoff used to make steel wheels, don't know if they are still available.
Jim