I am making some doors that are going to be about three inches deep for a hanging tool cabinet, out of frames held together with box joints. Because the panel is going to be a different wood with a different finish, I'd like to finish the frames/rails (for lack of a better term) first but I'm a bit stumped on how to do this without getting my finish on the joints and screwing up eventual glue adhesion. I suppose I could try tape, or even slip everything together without the glue and finish, but I'm wondering if there's a better approach.
Ideas? TIA, Tony