Probably you know this, but I found it on net, for any case. Drawings should be the "spanish" type. I could not find any photo's.
"The Fokker D.XXI in Spain:
1) Profile of how the Spanish built D.XXI might have looked like
As you probably know a Republican delegation had signed a secret agreement for building 25 airframes and 50 wings under licence in Spain (I am still wondering about the reason why 50 wings are mentioned because the D.XXI was a monoplane from the outset and 25 spare wings in case of battle damage seem to much of a good thing to me). Anyway, when the Nationalists overran the factory in El Carmoli, San Vicente del Raspeig (Ribasa, Alicante), they found 50 sets of wings, 25 airframes and 25 landing gears according to Gerald Howson.
Dutch sources claim that the prototype was flown by a pilot named Palacios under supervision of general Herrera.
2) Artist impression of the first Spanish D.XXI
Some sources mention that the Dutch prototype of the D.XXI (FD-322), originally built for the Dutch East Indies and test-flown over there, was shipped to Spain as a pattern aircraft for the 25 aircraft to be built in Spain.
In fact this aircraft was never shipped to Spain and was destroyed in February 1942 during a Japanese bombing raid on Kalidjati airfield.
Most of the available information about the Spanish D.XXI story is already perfectly described on this forum, hereby the most relevant links (enlaces):
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http://www.network54.com/Forum/394728/thread/1154180125/Fokker+D-XXI•
http://www.network54.com/Forum/394728/thread/1155716399/Mas+sobre+el+Fokker+D-XXI+Espa%F1ol......Parte+I•
http://www.network54.com/Forum/394728/message/1155717162/Fokker+D.XXI+Parte+II•
http://www.network54.com/Forum/394728/message/1155718647/Fokker+D-XXI+Parte+III---
Spanish Republican Air Force
* An agreement was made between Fokker and the Spanish Republican government to build the D.XXI in a factory in El Carmoli, near Alicante. The number of aircraft to be build is not sure, but most likely 25. Probably only one (serialed CF-6) flew before the factory fell into Nationalist hands during the Spanish Civil War. with a second already completed. Some sources claim they were fitted with a Russian M-25 (licence-built Wright-Cyclone SR-1820) engine."