Well, I'm building an Boeing 737-800 on my own due to boredom at building fictional planes, the variants would be:
737-8K5 Jeju Air HL8321
737-8AS Jeju Air HL8089
737-8SH Jin Air HL8012
737-8B5 Jin Air HL7560
737-8B5 Generic RP-C7378
737-8Q8 T'way Air HL8030
737-8SH Generic RP-C7392
737-8LC Jeju Air HL8316
737-81M T'way Air HL8547
737-8K5 Generic RP-C7305
737-8AS(BCF) Generic ZK-ENE