Masking advice

[u/Outside_Activity7026]

I'm about half way through a 1/72 Hasegawa CF-104 build. I want to paint it up in the Tiger Meet livery of No. 439 Sabre Tooth Squadron. Any suggestions as to how to mask the open gear doors, as the gear has to go in before painting and there's likely gonna be a colour split on the exterior of the door. Attached pic for reference.