Ad: This forum contains affiliate links to products on Amazon and eBay. More information in Terms and rules
425,041. 1944 Germany GDP. In millions of 1990 American dollars.
69,280. 1944 Argentina GDP. 16% of Germany GDP.
Germany was light years ahead of Argentina in scientific and monetary resources.
A massive and life-long argument began between Drs. Messerschmitt and Lippish regarding the design path the Me-163 should take apon acceptance by Messerschmitt's for serial production. Lippish was adament that a constant stream gas turbine replace the powerplant designed for the aircraft, a hypergolic fuel reaction turbine. Lippish lost, he left the 163 program in late 1943, taking up residence at DVL labs in Vienna as a researcher. The Messerschmitt 163 B-2 was inherently more dangerous than any other aircraft accepted for serial production, it was also the fastest.
Both countries were poor, both monetarily and in industry ( What the Czechs had pre-war was pretty much gone at the end of WW II), Both had tooling in place to build the OLD German designs. It was more a matter of being forced to use the designs because that was what was available rather than choosing them from a selection of options. Same for the Planes the Czechs sold the Israeli's in 1948. Hardly anybody else would sell them anything let alone sell them first line equipment. Same as their tanks, they got some old Shermans, not because they were good but because they were available in junk/scrap yards.
You make it sound like you could just decide to produce this or that design once you got the blueprints. You need the tooling to produce hundreds of subassemblies, you need to know the material compositions and you need people who know all those little bits of information that are not written on a sheet of paper, but are in the heads of a qualified engineering staff. The US had problems copying something as "simple" as a machine cannon, how would a country with a less professional industrial base (i. e. 90 per cent of the rest of the world) copy something as complex as an aircraft.