This thread goes into some detail
You need the cricut design space app to design the masks. It’s really easy to use. For the wing roundels I used two different sized circles, when the cricut cuts you get the outer ring and an inner circle to cover up the red once I spray it. For the fuselage roundels I did the same, but then found a font that matched the decals and added the 33. Once layered on the app you get the ring, and a inner circle with two 33’s cut into it. I then use transfer tape to move it all to the plane which keeps everything aligned. I then removed the inner circle leaving behind the 33 and the ring. Once I spray the red I’ll I’ll in the circle with masking tape. Here is a picture of the stencils on design space
the white lines show where cuts will be made
I agree! I love Japanese aircraft and the Jill is no exception, for such a large plane it still looks super elegant and sleek to me.