This is a really interesting aircraft. According to this website:
http://histaviation.com/Reggiane_Re_2000.html
and
Imagine the Re2000 with a Bristol Hercules engine
Allegedly the Reggiane Re 2000 was based on the Seversky P-35
http://aerostories.free.fr/severskyP35/page10.html
http://www.avrosys.nu/aircraft/Jakt/111J20.htm
Another member of this family is the PZL P 50 " Jarstrzab " (Hawk)
http://histaviation.com/Reggiane_Re_2000.html
At Guidonia the Re.2000 was evaluated by Colonels Tondi and Quarantotti, and displayed remarkable manoeuvrability. Indeed, its powers of manoeuvre were even superior to those of the Fiat CR.42 biplane against which it flew in a series of mock dogfights. Later, it was to be flown in mock combat against the Messerschmitt Bf 109 at Guidonia, and to emerge the victor when flown by both Italian and German pilots.
and
December 1939 also saw the arrival of a British Mission in Italy led by Lord Hardwick, the purpose of which was to purchase arms and particularly aircraft. Wing Commander H N Thornton, representing the Air Ministry, visited several of the Caproni factories, including the "Reggiane" works at Reggio Emilia. Negotiations were initiated for the purchase of Isotta Franschini marine engines, a thousand 20-mm cannon, 300 Ca313 light reconnaissance bombers, 100 Ca.311 trainers, and 300 Re.2000 fighters! On December 22nd, pilots Gray and Barnet accompanying the British Mission flight tested the Re.2000, and a month later, on January 26, 1940, the Director of Aircraft Contracts confirmed the British order for the "Reggiane" fighters. Surprisingly, on March 8, 1940, the German government signified its approval to the Italian government of the sale of Italian aircraft to Britain, but within a few weeks, on April 6th, this approval was withdrawn. Nevertheless, on May 15th Count Caproni and Lord Hardwick finalised a scheme whereby the aircraft would be sold to Britain by Portugal, the Caproni group having a Portuguese subsidiary, the Soc Aeroportuguesa. However, on June 10, 1940, Italy entered the war on Germany's side, and thus the devious schemes prepared to evade the German embargo on the sale of Italian aircraft to Britain came to nought.
Imagine the Re2000 with a Bristol Hercules engine
Allegedly the Reggiane Re 2000 was based on the Seversky P-35
Roberto Longhi, the chief engineer of the Italian firm Caproni-Reggiane created the Reggiane 2000 from the drawings of the P-35, with an improvement of its aerodynamic properties.
http://aerostories.free.fr/severskyP35/page10.html
http://www.avrosys.nu/aircraft/Jakt/111J20.htm
Another member of this family is the PZL P 50 " Jarstrzab " (Hawk)