Don 't need a mask kit Aaron. Get some Tamiya masking tape, and cover the required areas. Then, using a fine (propelling ) pencil, use the tip of this, sanded to a chisel edge, to mark the frame areas. This can be easily done by using the chisel point against any raised detail.
Then, with a sharp blade, carefully remove the frame area tape, then paint, easy- peasy - but takes time to prepare !