Note this might have been just a private design by the same students, not entirely affiliated with Riga Aviation Institute, since it doesn't carry the "Riga" prefix in the designation.
Chronologically, The Chaika-1 (Seagull-1) was built after the Riga-50 and 59. The Riga-AS-2 was built shortly after it, followed by the Riga-72.
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lllllAs of 2019 I have transitioned; My name is now Rei. Please don't deadname or misgender me, thank you. <3 lllll