Sorry, but Pilatus had nothing to do with MS406.
They were licence built by Doflug (Swiss Dornier).
Type was developed further into D-3802 with Me-109 type canopy and D-3803 with Mustang type bubble canopy.
D-3803 was built as single prototype only. Both D-3802 and D-3803 had new all metal monocoque fuselage instead of welded steel tube fuselage coverd with fabric at rearside and 'Contreplaque Aluminium' panels at front fuselage side.
D-3802 was built in small numbers only, but served with Swiss AF until late fifties. Also single D-3803 was used operationally alongside D-3802's